An endoscope includes: an insertion portion configured to be inserted into a subject； an image sensor configured to acquire an image of the subject； a distal end constituting portion that includes a mounting portion having a hole shape and used for mounting the image sensor, and two communication portions for allowing the mounting portion to communicate with outside of the distal end constituting portion； a signal cable that includes two signal line groups, the signal line groups including a plurality of signal lines configured to transmit signals acquired by the image sensor； a channel that is inserted into a space formed by the two signal line groups of the signal cable, and that allows an elongated member to be inserted in the channel； and a tubular portion that has a tubular shape and allows the signal cable and the channel to be inserted in the tubular portion.
