Pipe mounting structure in work machine

A pipe mounting structure, in the work machine, for mounting a plurality of pipes on an outer peripheral surface of at least one of a boom and an arm of the work machine provided with the boom that is liftably mounted to a base machine, and the arm that is mounted at a tip end of the boom to be able to rotate about a horizontal axis,

• the pipe mounting structure comprising:
• a mounting portion, to which the plurality of pipes are mounted, the mounting portion being provided to at least one of the boom and the arm and having an upper plate, a lower plate provided at a position separated from the upper plate in a downward direction, and a pair of side plates arranged on both sides in a width direction of the upper plate and the lower plate, end portions of the upper plate, the lower plate or the side plates protruding outwardly to form at least a pair of protruding portions;
• a bridge member which is bridged between the pair of protruding portions, the plurality of pipes being fixed to the bridge member;
• and
• a connecting portion which connects the protruding portions and end portions of the bridge member to each other.