diff --git a/public/2D_material/modal.webp b/public/2D_material/modal.webp
new file mode 100644
index 0000000..6eabff7
Binary files /dev/null and b/public/2D_material/modal.webp differ
diff --git a/src/components/ui/Modal/index.module.css b/src/components/ui/Modal/index.module.css
new file mode 100644
index 0000000..15e77bc
--- /dev/null
+++ b/src/components/ui/Modal/index.module.css
@@ -0,0 +1,21 @@
+.modal-background{
+    background-color:#08000080;
+    width:100%;
+    height:100%;
+    position:fixed;
+    left:0;
+    top:0;
+    z-index:0;
+   
+}
+
+.modal-content-wrapper{
+    position:absolute;
+    left:50%;
+    top:30%;
+    translate: -50% -50%;
+    z-index:10;
+    border: none;
+    border-radius: 8px;
+    overflow: hidden;
+}
\ No newline at end of file
diff --git a/src/components/ui/Modal/index.tsx b/src/components/ui/Modal/index.tsx
new file mode 100644
index 0000000..f492711
--- /dev/null
+++ b/src/components/ui/Modal/index.tsx
@@ -0,0 +1,81 @@
+import { useCallback, useEffect, useRef } from "react";
+import type { FC, ReactNode } from "react";
+import { createPortal } from "react-dom";
+import styles from "./index.module.css";
+
+type Props = {
+	open: boolean;
+	children: ReactNode;
+	onClose?: () => void;
+	onOpen?: () => void;
+};
+
+export const Modal: FC<Props> = ({
+	children,
+	open,
+	onClose = () => {},
+	onOpen = () => {},
+}) => {
+	const dialogRef = useRef<HTMLDialogElement>(null);
+
+	const handleShowModal = useCallback(() => {
+		onOpen();
+		dialogRef.current?.showModal();
+	}, [onOpen]);
+
+	const handleCloseModal = useCallback(() => {
+		onClose();
+		dialogRef.current?.close();
+	}, [onClose]);
+
+	useEffect(() => {
+		if (open) {
+			handleShowModal();
+		} else {
+			handleCloseModal();
+		}
+	}, [open, handleShowModal, handleCloseModal]);
+
+	const handleKeyUp = useCallback(
+		(event: KeyboardEvent) => {
+			if (event.key === "Escape") {
+				handleCloseModal();
+			}
+		},
+		[handleCloseModal],
+	);
+
+	useEffect(() => {
+		if (open) {
+			document.addEventListener("keyup", handleKeyUp);
+		} else {
+			document.removeEventListener("keyup", handleKeyUp);
+		}
+		return () => {
+			document.removeEventListener("keyup", handleKeyUp);
+		};
+	}, [open, handleKeyUp]);
+
+	return createPortal(
+		<>
+			<dialog
+				ref={dialogRef}
+				className={styles["modal-content-wrapper"]}
+				onKeyDown={(e) => e.key === "Enter" && handleShowModal()}
+				tabIndex={-1}
+			>
+				{children}
+			</dialog>
+			{open && (
+				<button
+					type="button"
+					className={styles["modal-background"]}
+					onClick={handleCloseModal}
+					onKeyDown={(e) => e.key === "Enter" && handleCloseModal()}
+					aria-label="Close modal"
+				/>
+			)}
+		</>,
+		document.body,
+	);
+};
diff --git a/src/pages/shooter/index.module.css b/src/pages/shooter/index.module.css
index d1e228d..ca69fcd 100644
--- a/src/pages/shooter/index.module.css
+++ b/src/pages/shooter/index.module.css
@@ -22,4 +22,41 @@
 .cork img {
     width: 72px;
     height: 72px;
-}
\ No newline at end of file
+}
+.button-style {
+    position: absolute;
+    bottom: 6%;
+    right: 4%;
+  }
+  
+  .modal-wrapper {
+    padding: 24px 0;
+    border-radius: 8px;
+    background-color: white;
+    min-width: 320px;
+    display: flex;
+    flex-direction: column;
+    gap: 24px;
+    justify-content: center;  
+    align-items: center;  
+}
+
+.modal-description {
+    font-size: 18px;
+    padding: 0 36px;
+    text-align: center;  
+}
+
+.modal-selection-wrapper {
+    display: flex;
+    width: 100%;
+    flex-direction: row;
+    gap: 16px;
+    justify-content: center; 
+}
+
+.modal-row {
+    display: flex;
+    align-items: center;
+    justify-content: center; 
+}
diff --git a/src/pages/shooter/index.tsx b/src/pages/shooter/index.tsx
index 399a0cf..90c1474 100644
--- a/src/pages/shooter/index.tsx
+++ b/src/pages/shooter/index.tsx
@@ -1,8 +1,12 @@
 import { type KeyboardEventHandler, useState } from "react";
+import { DefaultButton } from "../../components/ui/Button";
+import { Modal } from "../../components/ui/Modal";
 import { ShooterButton } from "../../components/ui/ShooterButton";
 import style from "./index.module.css";
 
 function Shooter() {
+	const [isOpen, setIsOpen] = useState(true);
+
 	const initialImages = [
 		"/2D_material/cork.webp",
 		"/2D_material/cork.webp",
@@ -23,13 +27,11 @@ function Shooter() {
 
 	return (
 		<div>
+			<Modal open={isOpen} onClose={() => setIsOpen(false)}>
+				<ModalContent setIsOpen={setIsOpen} />
+			</Modal>
 			<div className={style.trigger}>
-				<ShooterButton
-					onClick={handleClick}
-					onKeyUp={handleKeyUp}
-					onKeyDown={handleKeyUp}
-					onKeyPress={handleKeyUp}
-				/>
+				<ShooterButton onClick={handleClick} onKeyUp={handleKeyUp} />
 			</div>
 			<div className={style.cork}>
 				{images.map((src) => (
@@ -40,4 +42,38 @@ function Shooter() {
 	);
 }
 
+type ModalContentProps = {
+	setIsOpen: (isOpen: boolean) => void;
+};
+
+const ModalContent: React.FC<ModalContentProps> = ({ setIsOpen }) => {
+	return (
+		<div className={style["modal-wrapper"]}>
+			<img
+				src="/2D_material/modal.webp"
+				alt="スマホを画面に向かって垂直におく図"
+				width="100"
+				height="100"
+			/>
+			<div className={style["modal-row"]}>
+				<p className={style["modal-description"]}>
+					スマホを画面に向かって
+					<br />
+					垂直に机の上に置いてね
+				</p>
+			</div>
+			<div className={style["modal-selection-wrapper"]}>
+				<DefaultButton
+					variant="outlined"
+					color="red"
+					size="md"
+					onClick={() => setIsOpen(false)}
+				>
+					置いたよ！
+				</DefaultButton>
+			</div>
+		</div>
+	);
+};
+
 export default Shooter;