The particle measurement device includes: an acquiring unit configured to acquire pad surface shape data indicating a surface shape of an electrode pad including a probe needle mark where a probe needle has contacted; a roughness calculating unit configured to calculate volume of a recessed portion recessed from a pad reference surface and volume of a protruding portion protruding from the pad reference surface based on the pad surface shape data; and a particle quantity calculating unit configured to calculate a particle quantity from a volume difference between the volume of the recessed portion and the volume of the protruding portion.