Abstract: [Problem] To provide a dimension measurement device without influenced by change in a usage environment while being able to measure precisely a dimension of medicine. [Solution] A dimension measurement apparatus S1 comprising a light source part L, a photographing part C, a medicine holder part H holding a medicine 1 disposed between the photographing part C and the light source part L while holding the medicine 1 being able to be photographed from different directions, a light source output power adjustment part U1 performing brightness adjustment of the light source part L based on luminosity of photographed image photographed by the photographing part C, and a shape measuring part U2, measuring an X direction and a Y direction of medicine 1 in an X direction and a Y direction each crossing at right angles with respect to the photographed image photographed after the brightness adjustment has performed at least one time.