Of the plurality (six pieces) of external terminals 57, four pieces thereof disposed at the rear side are the signal terminals 57A. The signal terminals 57A are disposed at spaced intervals to each other in the widthwise direction. The signal terminals 57A are electrically connected to the external board 6.

Of the plurality (six pieces) of external terminals 57, two pieces thereof disposed at the front side are the power source terminals 57B. The power source terminals 57B are disposed at spaced intervals to each other in the widthwise direction. The power source terminals 57B are electrically connected to the power source 7.

As shown in FIG. 2, the plurality (four pieces) of head-side terminals 58 are provided on the upper surface of the front end portion of the stage insulating layer 39 corresponding to the stage 22 and disposed at spaced intervals to each other in the widthwise direction. As shown in FIGS. 3A and 3B, the head-side terminal 58 extends in the front-rear direction so as to traverse the front end edge of the stage opening portion 25 and the front end edge of the connecting terminal-opening portion 45. The head-side terminal 58 is electrically connected to the magnetic head 3 via a head connecting material 66 to be described later. The head-side terminal 58 includes a front-side portion 58A, a central portion 58B, and a rear-side portion 58C.