A resin material measuring method which obtains a prescribed amount of a resin material by measuring liquid resin material, the resin material measuring method including: charging the resin material having a fluidity into an internal space of a cylinder (10) using a cylinder-piston mechanism which includes: the cylinder having a discharge aperture (15) at one end (10c) and the internal space being constant in cross-sectional area; and a piston (11) which is inserted in the internal space; determining a necessary movement stroke length of the piston corresponding to the resin material of a prescribed volume according to a relationship between the volume of the resin material and the cross-sectional area and the movement stroke length; discharging the resin material from the cylinder through the discharge aperture by moving the piston by the determined movement stroke length; and cutting the discharged resin material from the resin material located inside the cylinder.