A disk feeding device including: a base body; a storage portion configured to store 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 (34, 35) configured to push 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 holds the guide member; and locking position changing means (7, 19c) for changing a locking position of the holding body with respect to the base body, characterized in that the locking position changing means is configured to change the locking position of the holding body with respect to the base body along a track in a circumferential direction centered on the rotation axis. a base body; a storage portion configured to store 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 (34, 35) configured to push 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 holds the guide member; and locking position changing means (7, 19c) for changing a locking position of the holding body with respect to the base body, characterized in that the locking position changing means is configured to change the locking position of the holding body with respect to the base body along a track in a circumferential direction centered on the rotation axis. a holding body that holds the guide member; and locking position changing means (7, 19c) for changing a locking position of the holding body with respect to the base body, characterized in that the locking position changing means is configured to change the locking position of the holding body with respect to the base body along a track in a circumferential direction centered on the rotation axis.