What is a Diminished Passing Chord?

A diminished passing chord is a diminished chord used to connect two other chords by stepwise motion in a chord progression. It functions as a brief transitional harmony that smoothly links one chord to another rather than acting as a strong point of resolution.

This type of chord is often built on a note that lies between the roots or bass notes of two surrounding chords. For example, if a progression moves from C major to D minor, a diminished chord built on C♯ (C♯–E–G–B♭) may appear between them. The diminished chord acts as a bridge, allowing the harmony to move smoothly upward from C to D.

Diminished passing chords are commonly used in classical, jazz, gospel, and popular music to add chromatic motion and harmonic color. Because diminished chords contain symmetrical intervals and strong tension, they work well as transitional chords that briefly intensify the progression before resolving to the next stable harmony.