The analyzer (1) is connected to the flow path (12c) via one end of the flow path (12c), and a small amount of liquid sample (L) enters the flow path (12c) from the other end of the flow path (12c). A suction mechanism that holds the liquid sample (L) in a part of the flow path (12c) and a light that irradiates the liquid sample (L) held in a part of the flow path (12c) with light. The measuring unit (40) includes a measuring unit (40) configured such that the irradiation unit (41) and the light receiving unit that receives the light from the liquid sample (L) are located around the liquid sample. Has an opening width (L2) shorter than the liquid length (L1) in the flow path (12c) of the liquid sample (L) held in the flow path (12c), and the liquid sample (41) is transmitted from the light irradiation unit (41). A throttle portion (46) for narrowing the light toward L) is provided.
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