diff --git a/ykoiso/src/B006_Darts.java b/ykoiso/src/B006_Darts.java
new file mode 100644
index 0000000000000000000000000000000000000000..d9b7cc0c86ba85efd740c90d7d49b989e33c429e
--- /dev/null
+++ b/ykoiso/src/B006_Darts.java
@@ -0,0 +1,67 @@
+import java.util.Scanner;
+import java.math.BigDecimal;
+import java.math.RoundingMode;
+
+public class B006_Darts {
+    public static final double G = 9.8;
+
+    public static void main(String[] args) {
+        Scanner scan = new Scanner(System.in);
+        // 初期地点の高さ
+        final double originY = scan.nextInt();
+        // 初速
+        final double velosity = scan.nextInt();
+        // 角度
+        final double angle = scan.nextInt();
+        // 的までの距離
+        final double disatance = scan.nextInt();
+        // 的の高さ
+        final double targetY = scan.nextInt();
+        // 的の半径
+        final double targetRadius = scan.nextInt() / 2;
+        // 矢の最終地点の高さ
+        final double lastY = calcLandingPlace(originY, velosity, angle, disatance);
+        // 当たるかの判定
+        final boolean isHit = judgeHit(lastY, targetY, targetRadius);
+        showAnswer(isHit, lastY, targetY);
+        scan.close();
+    }
+
+    public static double calcLandingPlace(final double originY, final double velosity,
+            final double angle, final double disatance) {
+        // 度数で渡されるのでラジアン表記に直している
+        final double rad = Math.toRadians(angle);
+        final double child = G * Math.pow(disatance, 2);
+        final double mother = 2 * Math.pow(velosity, 2) * Math.pow(Math.cos(rad), 2);
+        final double lastY = originY + (disatance * Math.tan(rad)) - (child / mother);
+        return lastY;
+    }
+
+    // 当たるかの判定
+    // テスト用
+    public static boolean judgeHit(final double lastY, final double targetY,
+            final double targetRadius) {
+        // 的との誤差
+        final double errorAbsDistance = Math.abs(targetY - lastY);
+        if (errorAbsDistance <= targetRadius) {
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    public static void showAnswer(final boolean isHit, final double lastY, final double targetY) {
+        // 的との誤差
+        final double errorAbsDistance = Math.abs(targetY - lastY);
+        // 誤差、四捨五入用
+        final BigDecimal errorDistance =
+                new BigDecimal(errorAbsDistance).setScale(1, RoundingMode.HALF_EVEN);
+        // 出力
+        if (isHit) {
+            System.out.print("Hit ");
+            System.out.println(errorDistance);
+        } else {
+            System.out.println("Miss");
+        }
+    }
+}
diff --git a/ykoiso/test/B006_DartsTest.java b/ykoiso/test/B006_DartsTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..7074a56f34ca4a30f4e943bf0b6497e638c8d86a
--- /dev/null
+++ b/ykoiso/test/B006_DartsTest.java
@@ -0,0 +1,24 @@
+import static org.junit.Assert.assertThat;
+import org.junit.Test;
+
+import static org.hamcrest.CoreMatchers.*;
+
+public class B006_DartsTest {
+    @Test
+    public void 的に当たると判断できる() {
+        B006_Darts cut = new B006_Darts();
+        final double lastY = cut.calcLandingPlace(10, 13, 45, 20);
+        final boolean actual = cut.judgeHit(lastY, 10, 10);
+        final boolean expected = true;
+        assertThat(actual, is(expected));
+    }
+
+    @Test
+    public void 的に当たらないと判断できる() {
+        B006_Darts cut = new B006_Darts();
+        final double lastY = cut.calcLandingPlace(10, 15, 45, 10);
+        final boolean actual = cut.judgeHit(lastY, 10, 5);
+        final boolean expected = false;
+        assertThat(actual, is(expected));
+    }
+}