diff --git a/yitou/B017_Card.java b/yitou/B017_Card.java
new file mode 100644
index 0000000000000000000000000000000000000000..b338a3ee2b2712e9381917f202e4bb3ad3e7b51e
--- /dev/null
+++ b/yitou/B017_Card.java
@@ -0,0 +1,87 @@
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Scanner;
+
+public class B017_Card {
+
+  // 手役を管理するenum
+  public enum COMB {
+        NO_PAIR("NoPair"),  // 0
+        ONE_PAIR("OnePair"),     // 1
+        TWO_PAIR("TwoPair"),   // 2
+        THREE_CARD("ThreeCard"),   // 3
+        FOUR_CARD("FourCard"); // 4
+
+    private final String name;
+
+    COMB(final String name) {
+      this.name = name;
+    }
+
+    @Override
+    public String toString() {
+      return name;
+    }
+  }
+
+  public static void main(final String[] args) {
+    final Scanner scanner = new Scanner(System.in);
+    final String input = scanner.nextLine();
+    scanner.close();
+
+    System.out.println(getBestPair(input));
+  }
+
+  public static COMB getBestPair(final String cards) {
+    final Map<Character, Integer> countMap = new HashMap<>();
+    int wildCardCount = 0;
+
+    // カードのカウント
+    for (char card : cards.toCharArray()) {
+      if (card == '*') {
+        wildCardCount++;
+      } else {
+        countMap.put(card, countMap.getOrDefault(card, 0) + 1);
+      }
+    }
+
+    // 0:ノーペア, 1:1ペア, 2:2ペア, 3:3カード, 4:4カード
+    final int[] counts = new int[5];
+    for (int count : countMap.values()) {
+      counts[count]++;
+    }
+
+    // 4カードの判定
+    if (counts[4] > 0) {
+      return COMB.FOUR_CARD;
+    }
+
+    // ワイルドカードを考慮した手役の判定
+    if (counts[3] > 0) {
+      // 3カードがある場合、ワイルドカードを加えて4カードにできるかチェック
+      if (wildCardCount > 0) {
+        return COMB.FOUR_CARD;
+      }
+      return COMB.THREE_CARD;
+    }
+        
+    if (counts[2] > 1) {
+      return COMB.TWO_PAIR;
+    }
+        
+    if (counts[2] == 1) {
+      // 1ペアがあれば、ワイルドカードを使って3カードにできるか確認
+      if (wildCardCount > 0) {
+        return COMB.THREE_CARD;
+      }
+      return COMB.ONE_PAIR;
+    }
+        
+    // ノーペアの場合、ワイルドカードがあれば1ペアにできる
+    if (wildCardCount > 0) {
+      return COMB.ONE_PAIR;
+    }
+
+    return COMB.NO_PAIR;
+  }
+}
diff --git a/yitou/B017_CardTest.java b/yitou/B017_CardTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..2080d2508de2abcc6da810779e6fdebb38fee026
--- /dev/null
+++ b/yitou/B017_CardTest.java
@@ -0,0 +1,40 @@
+import static org.hamcrest.MatcherAssert.*;
+import static org.hamcrest.Matchers.*;
+import org.junit.jupiter.api.Test;
+
+public class B017_CardTest {
+
+    @Test
+    public void ノーペアを判断できる() {
+        assertThat(B017_Card.getBestPair("ABCD"), is(B017_Card.COMB.NO_PAIR));
+        assertThat(B017_Card.getBestPair("XYZW"), is(B017_Card.COMB.NO_PAIR));
+        assertThat(B017_Card.getBestPair("VCSD"), is(B017_Card.COMB.NO_PAIR));
+    }
+
+    @Test
+    public void ワンペアを判断できる() {
+        assertThat(B017_Card.getBestPair("AZBB"), is(B017_Card.COMB.ONE_PAIR));
+        assertThat(B017_Card.getBestPair("A*BC"), is(B017_Card.COMB.ONE_PAIR));
+        assertThat(B017_Card.getBestPair("ABCA"), is(B017_Card.COMB.ONE_PAIR));
+    }
+
+    @Test
+    public void ツーペアを判断できる() {
+        assertThat(B017_Card.getBestPair("AABB"), is(B017_Card.COMB.TWO_PAIR));
+        assertThat(B017_Card.getBestPair("ZAAZ"), is(B017_Card.COMB.TWO_PAIR));
+    }
+
+    @Test
+    public void スリーカードを判断できる() {
+        assertThat(B017_Card.getBestPair("AAAB"), is(B017_Card.COMB.THREE_CARD));
+        assertThat(B017_Card.getBestPair("A*AB"), is(B017_Card.COMB.THREE_CARD));
+        assertThat(B017_Card.getBestPair("CCAC"), is(B017_Card.COMB.THREE_CARD));
+    }
+
+    @Test
+    public void フォーカードを判断できる() {
+        assertThat(B017_Card.getBestPair("AAAA"), is(B017_Card.COMB.FOUR_CARD));
+        assertThat(B017_Card.getBestPair("AA*A"), is(B017_Card.COMB.FOUR_CARD));
+        assertThat(B017_Card.getBestPair("AAA*"), is(B017_Card.COMB.FOUR_CARD));
+    }
+}