Provided is an extending/contracting flexible pipe that certainly has weather resistance, and also appropriately exhibits tie rod functionality and has a structure such that assembly is easy. The extending/contracting flexible pipe has: a pair of joint sections (1) configured in a manner able to oscillate and able to extend/retract with respect to each other; an attachment section (10) formed at the outer periphery of each of the pair of joint sections (1); a tie rod (5) inserted in a rod hole (11) formed at the attachment sections (10) and that bridges between the two attachment sections (10); and washers (6) and nuts (7) for securing the tie rod (5) to the attachment sections (10). An annular spacer (8) formed by means of an elastic member is attached to the tie rod (5). In the state of the spacer (8) being disposed within the rod hole (11), the washers (6) are attached at positions that occlude the rod hole (11). The spacer (8) is shielded from the outside by means of the washers (6).
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