It is possible to improve a measurement accuracy of a liquid flow volume, thereby improving reproducibility of a measured value. Provided is a flow volume measuring device including a light source which emits light to a measuring-target region； a light receiving element which receives light scattered at the measuring-target region from the light emitted from the light source； a contact member having translucency with respect to a wavelength of the emitted light and a wavelength of the scattered light, the contact member including a surface which faces the measuring-target region and with which the measuring-target region is contactable over the entire surface； and a flow volume measuring unit which measures a flow volume of liquid flowing through the measuring-target region based upon the scattered light.
