An analyzing apparatus includes a microchip, a detecting unit and an analyzing-measuring unit. The microchip is formed of a light transmissive material formed with a separation fluid channel that is a light measuring part. The detecting unit includes an emitted-light guiding unit that emits light to the separation fluid channel, and a received-light guiding unit that receives light through the separation fluid channel. The emitted-light guiding unit or the received-light guiding unit placed at a position facing a microchip support table via the microchip abuts the microchip, and pushes the microchip in a direction toward the microchip support table. The analyzing-measuring unit includes the detecting unit, the emitted-light guiding unit and the received-light guiding unit, and detects a constituent of a sample filled in the separation fluid channel.