A particle analysis apparatus for flow cytometry, which contains a flow cell having a flow channel for flowing a sample solution containing particles to be analyzed, a light source device for emitting an irradiation light, an optical system for irradiating the irradiation light on an irradiation segment in the flow channel, and a light receiving device for detecting the light obtained thereby. A light source of the light source device is LED, and an electrode formed on a light extraction surface thereof mainly contains a plurality of electric conductor lines arranged in parallel to each other.