To stably produce a resin material of desired blend ratio in which a masterbatch material is uniformly dispersed in a base material.

This metering device of resin materials for producing a resin material of prescribed blend ratio of a base material (A) and a masterbatch material B, includes a metering wheel 20 rotatably disposed adjacent to a base material storage section (a first hopper) 12 and a masterbatch material storage section (a second hopper) 16; a metering section 24 receiving a fixed amount of the masterbatch material at its outer circumferential surface 22; a feeding port 14 for continuously feeding the base material A in the storage section 12 to the outer circumferential surface 22 of the metering wheel 20; and a feeding port 18 for feeding the masterbatch material B in the storage section 16 to only the metering section 24. The metering wheel 20 rotates in the moving direction of the peripheral surface from the feeding port 18 toward the feeding port 14, and meters the base material (A) and the fixed amount of the masterbatch material (B) while blending them.