A measurement method measuring a volume of a drug in each needle-shaped recess of a mold includes: acquiring a reference surface height that is a height between a reference surface determined in advance with respect to a first surface on the side on which a drug is filled in the mold or a second surface opposite to the first surface, and the second surface； acquiring a first detection result by detecting a measurement wave emitted from a drug surface according to incidence of the measurement wave on the drug in the needle-shaped recess； detecting a first height between the reference surface and the drug surface； detecting a second height from the second surface to the drug surface based on the reference surface height and the first height； and calculating a volume of the drug based on the second height and a known shape of the needle-shaped recess.
