An inkjet recording apparatus comprising: an ink-droplet spray head that sprays an ink droplet; and an ink-droplet detecting unit that detects a spray state of the ink droplet, the ink-droplet detecting unit including a light-emitting element that emits a light, a light-emitting element holder that holds the light-emitting element, a light-receiving element that receives the light emitted from the light-emitting element, a light-receiving element holder that holds the light-receiving element, and a base member on which the light-emitting element holder and the light-receiving element holder are mounted at an emission-side positioning hole and a reception-side positioning hole, respectively, wherein the light-receiving element holder includes a reception-side holder shaft which is inserted into the reception-side positioning hole, so that the light-receiving element holder is slidably attached to the base member in a direction perpendicular to a rotational direction of the light-emitting element holder, and the ink-droplet detecting unit is attached to a main body of the inkjet recording apparatus, characterized in that the light-emitting element holder includes an emission-side holder shaft which is inserted into the emission-side positioning hole, so that the light-emitting element holder is rotatably and adjustably attached to the base member, wherein an emission point of the light-emitting element is arranged on a position corresponding to a shaft center of the emission-side holder shaft, and a shaft center of the reception-side holder shaft is arranged in parallel to a light-receiving surface of the light-receiving element. an ink-droplet spray head that sprays an ink droplet; and an ink-droplet detecting unit that detects a spray state of the ink droplet, the ink-droplet detecting unit including a light-emitting element that emits a light, a light-emitting element holder that holds the light-emitting element, a light-receiving element that receives the light emitted from the light-emitting element, a light-receiving element holder that holds the light-receiving element, and a base member on which the light-emitting element holder and the light-receiving element holder are mounted at an emission-side positioning hole and a reception-side positioning hole, respectively, wherein the light-receiving element holder includes a reception-side holder shaft which is inserted into the reception-side positioning hole, so that the light-receiving element holder is slidably attached to the base member in a direction perpendicular to a rotational direction of the light-emitting element holder, and the ink-droplet detecting unit is attached to a main body of the inkjet recording apparatus, characterized in that the light-emitting element holder includes an emission-side holder shaft which is inserted into the emission-side positioning hole, so that the light-emitting element holder is rotatably and adjustably attached to the base member, wherein an emission point of the light-emitting element is arranged on a position corresponding to a shaft center of the emission-side holder shaft, and a shaft center of the reception-side holder shaft is arranged in parallel to a light-receiving surface of the light-receiving element.