To provide a resin particle excellent in melting at a low-temperature and in a short time and heating adhesiveness, with a uniform particle diameter.

A resin particle (C) is formed by adhering a shell layer (S) containing a crystalline polyurethane resin (U) on a surface of a core layer (Q) containing a resin (R). The resin particle in which maximum peak temperature (Ta) of heat of fusion of (U) is 40-100C and a ratio of a softening point and the maximum peak temperature (Ta) of the heat of fusion (softening point/Ta) is 0.8-1.55, is used.