Power generating apparatus having ball bearings

A power generating apparatus comprising:

• a first substrate (2b, 2c) provided with a first electrode (3) on one surface;
• a second substrate (1a) including a second electrode (6) arranged to be opposed to said first electrode;
• and
• a sliding mechanism (10, 11, 12, 13, 14) provided on at least either one surface side or another surface side of said first substrate,
• wherein said sliding mechanism is so formed as to retain said first substrate to be relatively movable with respect to said second substrate in a second direction along one surface of said first substrate while inhibiting the same from moving in a first direction orthogonal to the surface on which said first electrode is arranged, and
• said sliding mechanism includes a ball bearing arranged between said first substrate and said second substrate, and a first groove portion provided on one surface side of said first substrate so that said ball bearing is movably arranged thereon, and said first groove portion extends in said second direction so that said ball bearing is movable in said second direction, and the width of opening end portion of said first groove portion is larger than the diameter of said ball bearing so that a clearance region capable of absorbing an impact in a direction orthogonal to said second direction in plan view is provided between said ball bearing and said first groove portion.