DEFLECTOR DEVICE AND ROTATION BIASING DEVICE

A deflector device includes a deflector that is arranged at a front edge, portion of a roof opening portion, an arm that supports the deflector, a holder that rotatably supports the arm, and a spring member that is interposed between the holder and the arm and thereby rotationally biases the arm in a direction in which the deflector is spread. To the holder, an engaging piece that has a claw portion engaging with an edge portion of a mounting hole formed at a fixing position (a support surface of a base member) at which the holder is fixed is disposed. To the engaging piece, a pressed portion against which the spring member pressing the holder is pressed and that thereby reinforces an engagement state of the claw portion with the edge portion of the mounting hole is disposed.