A foot-operated parking brake operation device (10; 60; 70; 80) comprising: an operation pedal which is mainly made of a metal plate material, and which actuates a parking brake when depressed to be pivoted in one direction about a support axis; a ratchet member which is fixedly attached to the operation pedal, and which has multiple teeth arranged along an arc about the support axis; a pawl disposed on a pedal support and pivotable about an axis parallel to the support axis, the pawl being configured, when meshing with one of the teeth, to prevent the operation pedal from being pivoted back toward an original position thereof in a direction opposite to the one direction whereby the parking brake is kept in an actuated state thereof; a pawl biasing spring biasing the pawl in such a rotational direction that causes the pawl to mesh with one of the teeth; and upon start of a brake operation that is an operation of depressing the operation pedal, the pawl being relatively moved from a front end of the ratchet member so as to ride over the teeth, such that each time the pawl rides over each of the teeth, the pawl is brought into contact with a subsequent one of the teeth that is subsequent to the each of the teeth, due to a biasing force of the pawl biasing spring applied to the pawl, wherein the operation pedal includes a flat plate-shaped flat portion (24, 28; 24, 28; 72; 24) located between the support axis and the ratchet member, and the flat portion is provided with a bead (56, 58; 56, 58, 62,; 74; 82) which is formed by bending the flat portion and which has a convex section, the bead extending in a direction crossing a vibration waveform of ratchet sound, which would be generated when the pawl is brought into contact with each of the teeth due to the biasing force of the pawl biasing spring in absence of provision of the bead in the flat portion, characterized in that the operation pedal includes a flat attachment seat (28; 28; 72) bent into a crank in a thickness direction, the ratchet member is fixedly attached to the attachment seat, and the bead (56; 56; 74) is formed in the attachment seat corresponding to the flat portion. an operation pedal which is mainly made of a metal plate material, and which actuates a parking brake when depressed to be pivoted in one direction about a support axis; a ratchet member which is fixedly attached to the operation pedal, and which has multiple teeth arranged along an arc about the support axis; a pawl disposed on a pedal support and pivotable about an axis parallel to the support axis, the pawl being configured, when meshing with one of the teeth, to prevent the operation pedal from being pivoted back toward an original position thereof in a direction opposite to the one direction whereby the parking brake is kept in an actuated state thereof; a pawl biasing spring biasing the pawl in such a rotational direction that causes the pawl to mesh with one of the teeth; and upon start of a brake operation that is an operation of depressing the operation pedal, the pawl being relatively moved from a front end of the ratchet member so as to ride over the teeth, such that each time the pawl rides over each of the teeth, the pawl is brought into contact with a subsequent one of the teeth that is subsequent to the each of the teeth, due to a biasing force of the pawl biasing spring applied to the pawl, wherein the operation pedal includes a flat plate-shaped flat portion (24, 28; 24, 28; 72; 24) located between the support axis and the ratchet member, and the flat portion is provided with a bead (56, 58; 56, 58, 62,; 74; 82) which is formed by bending the flat portion and which has a convex section, the bead extending in a direction crossing a vibration waveform of ratchet sound, which would be generated when the pawl is brought into contact with each of the teeth due to the biasing force of the pawl biasing spring in absence of provision of the bead in the flat portion, characterized in that the operation pedal includes a flat attachment seat (28; 28; 72) bent into a crank in a thickness direction, the ratchet member is fixedly attached to the attachment seat, and the bead (56; 56; 74) is formed in the attachment seat corresponding to the flat portion.