An electromotive unit that produces an electric current in response to a pressure applied thereto when a user lands the ground on his/her foot while walking or running, or a pressure detector that detects variation in the applied pressure is formed like a flat plate and arranged within a small space in a shoe. A wire material is provided to deliver, outside the shoe, the electric current produced in response to the pressure applied when the user lands the ground on his/her foot or a signal indicative of the variation in the applied pressure. The wire material is connected to a pedometer unit outside the shoe to perform counting. The wire material can be fixed and mounted onto a desired portion in the opening of the shoe by using a fastener or by being formed as a fixable wire material.