Injection drug takeout device

A drug dispensing device including cassettes detachably fitted to respective shelves of a storage shelf and storing different types of drugs, each of the cassettes comprising:

• a rotor configured to hold a held drug at a closed position at one end side thereof and to rotate the held drug to an open position to thereby permit the held drug to be taken out of the cassette;
• and
• biasing means configured to bias a stored drug to a rotor side of the cassette to thereby arrange the stored drug,
• wherein the biasing means comprises:
• a casing having a front contact surface that contacts the stored drug,
• a constant load spring that is provided in the casing and that includes a spring part having a leading end thereof fixed to the rotor side of the cassette,
• a locking member that is provided in the casing to be rotatable about a support shaft and that includes a gear part for engaging with and disengaging from a locking rack formed in the cassette, and
• a pressing member that projects in a pressable manner from the front contact surface of the casing, the pressing member having a first end surface that contacts the stored drug and a second end surface that contacts the locking member,
• wherein if the first end surface of the pressing member contacts the stored drug, then the pressing member is pressed and the second end surface of the pressing member contacts the locking member to rotate the locking member about the support shaft, whereby the gear part disengages from the locking rack.