A disk feeding device including: a base body; a storage portion that stores a disk; a rotary member that is disposed in the base body and is rotatable; a feeding passage that is provided in the base body and through which the disk fed toward an outside of a device passes; and a guide member and a feeding member that face each other via the feeding passage, the rotary member including a circular through hole that penetrates in a rotation axis direction and a push portion that pushes the disk in a rotation direction to move the disk, and moving the disk that is sent to the rotary member from the storage portion and passes through the through hole with the push portion in the rotation direction, the guide member guiding the disk moved to a predetermined position of the rotation direction toward the feeding passage, the feeding member being capable of reciprocating in a direction in which a distance from the guide member is changed, and feeding the disk pinched between the feeding member and the guide member by a biasing force of a biasing member while being biased toward the guide member by the biasing member, the disk feeding device comprising: a holding body that reciprocally holds the feeding member and is separated from the base body; and locking position changing means (7, 21c, 8, 23, 26) for changing a locking position of the holding body with respect to the base body along a track in a direction in which the distance is changed, characterized in that a first tooth row including a plurality of teeth arranged at a predetermined interval along the track is provided in the base body, a second tooth row that includes a plurality of teeth and meshes with the first tooth row is provided in the holding body, and the holding body is configured to be capable of being attached to and detached from the base body in a tooth width direction of the first tooth row, or a tooth row including a plurality of teeth arranged at a predetermined interval along the track is provided in the base body, a gear meshing with the tooth row is provided on the holding body, and the locking position changing means includes at least the tooth row and the gear. a base body; a storage portion that stores a disk; a rotary member that is disposed in the base body and is rotatable; a feeding passage that is provided in the base body and through which the disk fed toward an outside of a device passes; and a guide member and a feeding member that face each other via the feeding passage, the rotary member including a circular through hole that penetrates in a rotation axis direction and a push portion that pushes the disk in a rotation direction to move the disk, and moving the disk that is sent to the rotary member from the storage portion and passes through the through hole with the push portion in the rotation direction, the guide member guiding the disk moved to a predetermined position of the rotation direction toward the feeding passage, the feeding member being capable of reciprocating in a direction in which a distance from the guide member is changed, and feeding the disk pinched between the feeding member and the guide member by a biasing force of a biasing member while being biased toward the guide member by the biasing member, the disk feeding device comprising: a holding body that reciprocally holds the feeding member and is separated from the base body; and locking position changing means (7, 21c, 8, 23, 26) for changing a locking position of the holding body with respect to the base body along a track in a direction in which the distance is changed, characterized in that a first tooth row including a plurality of teeth arranged at a predetermined interval along the track is provided in the base body, a second tooth row that includes a plurality of teeth and meshes with the first tooth row is provided in the holding body, and the holding body is configured to be capable of being attached to and detached from the base body in a tooth width direction of the first tooth row, or a tooth row including a plurality of teeth arranged at a predetermined interval along the track is provided in the base body, a gear meshing with the tooth row is provided on the holding body, and the locking position changing means includes at least the tooth row and the gear. a holding body that reciprocally holds the feeding member and is separated from the base body; and locking position changing means (7, 21c, 8, 23, 26) for changing a locking position of the holding body with respect to the base body along a track in a direction in which the distance is changed, characterized in that a first tooth row including a plurality of teeth arranged at a predetermined interval along the track is provided in the base body, a second tooth row that includes a plurality of teeth and meshes with the first tooth row is provided in the holding body, and the holding body is configured to be capable of being attached to and detached from the base body in a tooth width direction of the first tooth row, or a tooth row including a plurality of teeth arranged at a predetermined interval along the track is provided in the base body, a gear meshing with the tooth row is provided on the holding body, and the locking position changing means includes at least the tooth row and the gear.