A brushless fan motor, in which cooling effect on a stator may be enhanced, is provided. The tunable laser device may include a diffraction grating connected to a pivot arm that pivots the diffraction grating about a pivot point to tune the laser device. The shaft member has a guide part formed with an insertional hole through which the wire is inserted, and at least the guide part of the shaft member is turnable around the center axis of the shaft member, to both the two articulation wheels coupled by the shaft member.