Provided is a microparticle measurement device that can deliver a liquid used in the analysis of microparticles in a stable manner. The microparticle measurement device includes a plurality of first tank units to which a liquid is supplied from the outside, and which are respectively connected in parallel, and a bulb unit that is connected to the plurality of first tank units, and which switches to a state in which it is possible to deliver the liquid to a flow channel through which microparticles flow. According to this microparticle measurement device, in addition to performing liquid delivery from a portion of the plurality of first tank units, in which the replenishment of liquid has been completed, to a flow channel, it is possible to supply liquid from the outside to the plurality of first tank units other than the plurality of first tank units that are delivering liquid.