A parking brake apparatus has a base, a ratchet plate fixed to the base, an operation lever includes a rotational base portion pivotally supported on the base; a pawl adapted to engage/disengage withthe ratchet plate; an arc-shaped intermediate member comprises an arc-shaped relay rod; and a grip for controlling the engagement of the pawl. The arc-shaped relay rod is divided into at least two andis made to be interlocked with operations by the grip to transmit an engagement/disengagement operation with the ratchet plate to the pawl, the ratchet plate and the rotational base portion are provided inside a body side mounting portion, and the intermediate member is provided in such a manner as to appear from and disappear into a passage hole in the body side mounting portion.