A medicine supply apparatus that subdivides and supplies medicines is provided. The medicine supply apparatus includes: a cassette unit that is provided movably between a fixed position and a drawn position, and can temporarily retain the medicines in a subdivided manner; a cover provided movably between a closed position to cover the cassette unit from above and an opened position where the cassette unit is exposed; and an association mechanism that associates operations of the cassette unit and the cover, wherein the association mechanism restricts an operation of the cover so as to keep the cover in the closed position when the cassette unit is in the drawn position.