Particle analyzer including a rod lens having a curved surface

摘要

A particle analyzer which can maintain optical characteristics of an optical system which is one component thereof at a fixed level for a long period of time is provided. In the particle analyzer comprising a flow cell for forming a sheathed sample flow containing particulate components; an irradiating optical system for irradiating a sheathed sample flow formed in the flow cell; and a light receiving optical system for receiving light emitted from the sheathed sample flow in the flow cell irradiated by the irradiating optical system, the light receiving optical system comprises a rod lens to which the light emitted from the sheathed sample flow in the flow cell enters and an entrance surface of the rod lens is curved.