Patent ID: 8485633

Claim:
A droplet detecting device that detects a discharge state of a liquid droplet by receiving a light beam emitted to a flying path of the liquid droplet discharged from a nozzle of an inkjet printer, the droplet detecting device comprising a detection unit, the detection unit including: a light emitting unit that emits the light beam; a light receiving unit that receives the emitted light beam; and a base unit integrally supporting the light emitting unit and the light receiving unit, wherein the base unit includes: at least two positioning units that are engaged with a mounting base of the inkjet printer and determine a fastening position of the detection unit onto the inkjet printer; and a first fastening unit that fastens the base unit to the mounting base of the inkjet printer, and wherein, in the state of the detection unit being fastened to the inkjet printer, only the positioning units and the first fastening unit are in contact with the mounting base of the inkjet printer.