An endoscope is provided having an observation port, a fluid supply pipe, a cap, a fluid ejection channel, and a direction adjustment protrusion. The observation port is provided at the distal end of the endoscope, and collects light reflected from an object. The fluid supply pipe transmits gas and/or liquid to the distal end. The cap blocks the distal end of the fluid supply pipe and is configured so that a partially enclosed semispherical space is created between the distal end of the fluid supply pipe and the inner surface of the cap. The fluid ejection channel has an outlet in the direction of the observation port, and extends from the edge of the opening at the distal end of the fluid supply pipe to the outlet and occupies the semispherical space inside the cap. The direction adjustment protrusion extends over the outlet in the lengthwise direction of the fluid ejection channel. When the outlet is projected outward toward the observation port, the plane of projection is parallel to the outlet and its lengthwise direction is parallel to the circumferential direction of the outlet. The direction adjustment protrusion is configured at the center of the outlet in the circumferential direction.