Herein a medicament delivery device (2) is disclosed. The device (2) comprises a housing (4), a container holder (22) for a medicament container (11), a first energy accumulating member (14) for powering a dispensing of a medicament from the medicament container (11), and a releasable first locking arrangement (18) for locking the first energy accumulating member (14) in a first energy storing position. The medicament delivery device (2) further comprises a second energy accumulating member (16) for powering a mixing of a medicament in the medicament container (11), and a releasable second locking arrangement (20) for locking the second energy accumulating member (16) in a second energy storing position. The second locking arrangement (20) in a first state prevents the first locking arrangement (18) from being released, and the second locking arrangement (20) in a second state permits the first locking arrangement (18) to be released.
