A component support device (7) that attaches components (61, 62) on a working structure (41) of a construction machine is formed by bending a plate along at least two bending lines, the component support device (7) including a support (711) formed at a center portion between the two bending lines for supporting the components (61, 62), and a pair of attachment legs (712, 713) formed at both sides of the support (711) to be fixed on the working structure (41), in which at least one of the pair of attachment legs (712, 713) is split into a plurality of portions at a portion to be fixed on the working structure (41), and rigidity of the attachment leg (712, 713) against a bending line direction is less than rigidity of the support (711) in the bending line direction.