An endoscope of the invention includes: an insertion portion including in a distal end portion thereof an image pickup portion for picking up an image of an object in a living body; an operation portion connected to a proximal end side of the insertion portion; a cable including a connector portion connectable to a processor for performing signal processing on a signal outputted when the image of the object is picked up; a light source portion for emitting light to illuminate the object, the light source portion being provided in the connector portion; a light transmitting portion for transmitting the light emitted from the light source portion to the distal end portion to emit the light to the object; and a heat-radiating portion capable of radiating heat emitted from the light source portion, the heat-radiating portion being provided in the connector portion.