Glass flakes and resin composition

A resin composition, comprising:

• glass flakes;
• and
• a matrix resin, wherein
• the glass flakes have an average particle diameter of 0.1 to 15 μm and an average thickness of 0.1 to 2 μm;
• and
• the glass flakes have a particle size distribution in which a particle diameter at 99% of a cumulative volume from a smaller particle diameter is 45 μm or less, and a maximum particle diameter of the glass flakes is 62 μm or less,
• at least a portion of a surface of each of the glass flakes is covered by a surface treatment agent,
• the surface treatment agent comprises at least one selected from the group consisting of a binder component and a silane coupling agent, and
• a proportion of a coating composed of the surface treatment agent in the glass flakes is 0.05 to 2 mass %.