Two-component developer

A two-component developer comprising:

• a toner containing toner particles;
• and
• a carrier containing carrier particles, wherein
• the toner particles each include a toner mother particle and external additive particles provided on a surface of the toner mother particle,
• the external additive particles include resin particles,
• the resin particles contain a thermoplastic resin,
• the carrier particles each include a carrier core and a coat layer covering a surface of the carrier core,
• the coat layers contain a coating resin and barium titanate particles,
• the coating resin includes a silicone resin,
• the barium titanate particles have a number average primary particle diameter of at least 100 nm and no greater than 500 nm,
• the barium titanate particles have a content of at least 4 parts by mass and no greater than 45 parts by mass relative to 100 parts by mass of the coating resin,
• a rate of a mass of the coat layers to a mass of the carrier cores is at least 0.10% by mass and no greater than 4.90% by mass, and
• an average of coverage rates of the carrier cores is at least 80.0% and less than 100.0%, each of the coverage rates being a rate of an area of a covered region of the carrier core covered with the coat layer to an area of the surface of the carrier core.