An endoscope includes: a direction conversion module for converting rotational motions of the upper and lower sprockets to linear motions of the upper and lower chains while maintaining linear states of the upper and lower chains pulled, and pushed upon rotational operation of the operation part, in which the direction conversion module includes: first and second connection blocks for connecting both ends of the upper chain to one end of each of the first and second connection wires of the operation part, and third and fourth connection blocks for connecting both ends of the lower chain to one end of each of the third and fourth connection wires of the operation part.