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人気のピアノコード

以下は当サイトの人気コードガイドです。コードをクリックすると、完全な図解、運指、詳細な説明が表示されます：

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ルート音とコードタイプ別に整理された完全なピアノコードコレクションをご覧ください：

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ピアノコードとは？

コードは、ハーモニーを作るために一緒に演奏される音符のグループです。ピアノでは、コードがクラシックからジャズ、ポップ、ロックまで、あらゆるジャンルの膨大な曲の基盤を形成しています。伴奏を演奏したい、作曲したい、または曲の仕組みを理解したいと思うピアニストにとって、コードの理解は不可欠です。

Types of Piano Chords

Chords can be grouped into several families based on how many notes they contain and how those notes relate to each other:

• Triads — The most basic chords, made of three notes. These include major, minor, augmented, and diminished chords.
• Seventh chords — Four-note chords that add a seventh interval to a triad. Examples include major 7th, minor 7th, and dominant 7th.
• Extended chords — Chords that go beyond the seventh, adding ninths, elevenths, or thirteenths for even richer harmonies.

Each type of chord has a distinct emotional quality. Major chords tend to sound bright and happy, minor chords sound darker and more introspective, and seventh chords add color and sophistication. On this site, we cover all the most common chord types with clear diagrams and explanations — see our complete chord types guide for details.

ピアノコードの弾き方

ピアノコードの演奏は思うより簡単です。基本の三和音（3つの音符のコード）から始め、次にセブンスコードなどへ進みましょう。当サイトの各コードには、どの鍵盤を押すかを正確に示す明確な鍵盤図と、両手の推奨運指が含まれています。

Step-by-Step: Learning Your First Chords

1. Start with C major — It uses only white keys (C-E-G) and is the easiest chord to visualize. Find C on the keyboard (the white key just to the left of the group of two black keys), then count up 4 half-steps to E, then 3 more to G.
2. Add A minor — A minor (A-C-E) shares two notes with C major, making the transition smooth. Practice switching between these two chords until it feels natural.
3. Learn G major and F major — These two chords, along with C major and A minor, form the basis of thousands of songs.
4. Practice chord transitions — The real skill is not playing individual chords but moving between them smoothly. Start slowly, keeping your hand close to the keys.
5. Try a simple progression — Play C → G → Am → F and loop it. Congratulations, you are playing one of the most popular chord progressions in pop music.

Tips for Practicing Chords Effectively

• Keep your hands relaxed — Tension is the enemy of speed and accuracy. Shake out your hands between practice sessions.
• Practice slowly at first — Speed comes from accuracy, not from forcing your fingers to move faster. Start at a tempo where you can play every transition cleanly.
• Use a metronome — Even a simple tapping foot can help you develop a steady rhythm while practicing chord changes.
• Learn chords in context — Instead of memorizing chords in isolation, learn them as part of progressions. This helps you understand how they relate to each other and how they sound in actual music.
• Train your ear — Try to identify whether a chord is major or minor by listening. Over time, you will be able to recognize more complex chord types as well.

Left Hand vs. Right Hand

When accompanying a melody, you typically play chords with your left hand and the melody with your right hand. For solo playing, you might distribute chord notes between both hands. On each chord page, we provide fingering suggestions for both hands — check our complete fingering guide for more tips.