A coin feeding apparatus (21; 50), comprising: a disk (31; 51) that includes a plurality of protrusions (38, 39; 52) on a surface of the disk, is disposed to be inclined and rotatable, and, when rotating, causes a first coin (C21, C22; C61, C62, C63, C64) and a second coin (C25; C73) to be caught on and carried upward by the plurality of protrusions, the second coin having a diameter greater than that of the first coin; a cover (35; 53) that forms, between the cover and the surface of the disk, a space for storing a coin therein; and a separation unit that is configured to separate one coin out of two of the first coins from the plurality of protrusions so as to cause the one coin to fall into the space, the two first coins being caught on the plurality of protrusions side by side, characterized in that the plurality of protrusions is disposed on the surface of the disk such that when the plurality of protrusions catches thereon the said two first coins, lying side-by-side in a radial direction of the disk, a portion of one coin of the two first coins projects out from a peripheral edge (31a; 51a) of the disk, wherein the said one coin is the outer coin, in the radial direction of the disk, of the said two first coins; and the separation unit is configured such that when the plurality of protrusions catches thereon the said two first coins lying side-by-side in a radial direction of the disk, the separation unit makes contact with the portion which projects out from the peripheral edge of the disk and separates the said outer coin from the plurality of protrusions so as to cause the outer coin to come off the disk and to fall into the space, and the separation unit is configured such that when the plurality of protrusions catches thereon one second coin, the separation unit does not make contact with the second coin, wherein the portion of the outer coin and a portion of the second coin project out from the disk at different positions. a disk (31; 51) that includes a plurality of protrusions (38, 39; 52) on a surface of the disk, is disposed to be inclined and rotatable, and, when rotating, causes a first coin (C21, C22; C61, C62, C63, C64) and a second coin (C25; C73) to be caught on and carried upward by the plurality of protrusions, the second coin having a diameter greater than that of the first coin; a cover (35; 53) that forms, between the cover and the surface of the disk, a space for storing a coin therein; and a separation unit that is configured to separate one coin out of two of the first coins from the plurality of protrusions so as to cause the one coin to fall into the space, the two first coins being caught on the plurality of protrusions side by side, characterized in that the plurality of protrusions is disposed on the surface of the disk such that when the plurality of protrusions catches thereon the said two first coins, lying side-by-side in a radial direction of the disk, a portion of one coin of the two first coins projects out from a peripheral edge (31a; 51a) of the disk, wherein the said one coin is the outer coin, in the radial direction of the disk, of the said two first coins; and the separation unit is configured such that when the plurality of protrusions catches thereon the said two first coins lying side-by-side in a radial direction of the disk, the separation unit makes contact with the portion which projects out from the peripheral edge of the disk and separates the said outer coin from the plurality of protrusions so as to cause the outer coin to come off the disk and to fall into the space, and the separation unit is configured such that when the plurality of protrusions catches thereon one second coin, the separation unit does not make contact with the second coin, wherein the portion of the outer coin and a portion of the second coin project out from the disk at different positions.