Conventional moisture-absorbing-releasing particles exhibit problems pertaining to peculiar color, a low degree of polymerization, residual monomer removal, use of an organic solvent in a production step thereof, drying associated with moisture absorption and release, generation of fine powder due to contraction, uses thereof, production steps thereof, durability, and the like. The present invention originated in order to address the realities of relevant conventional techniques, and the purpose of the present invention is to provide: moisture-absorbing-releasing particles which can be given a desired color, are easily producible, and do not produce a fine powder as a result of drying or the like; a resin molded article containing the particles; and various compositions. Spherical vinyl-based-polymer particles which have a carboxyl group, and contain, as copolymerization components, an ester-based crosslinking agent and an ether-based crosslinking agent which does not have an ester structure are disclosed.