Quick coupler (1) for attaching a tool (2), comprising an attachment bracket with two parallel attachment pins (3a, 3b), to an earth moving vehicle. The quick coupler (1) comprises a frame (4) with a first cutout (5) and a second cutout (6) arranged substantially perpendicular to each other, where the respective cutout is adapted to cooperate with the respective attachment pin (3a, 3b) of the tool (2). The quick coupler (1) further comprises at least one, in relation to the frame (4) moveable locking arrangement (9), adapted to delimit the second cutout (6) in a direction parallel to the first cutout (5), at least one, in the frame (4) arranged, actuator (8) adapted to move the locking arrangement (9) between a first open and a second locked position, and a lock indication device (10) which visually indicates if the locking part (9) is in the first or second position. The at least one actuator (8) is attached between the locking arrangement (9) and the lock indication device (10) and is arranged to move both the locking arrangement (9) and the lock indication device (10) in relation to the frame (4) so that the lock indication device (10) visually indicates when the locking arrangement (9) is in the second locked position by a protrusion of the lock indication device (10) from the frame (4) which therefore makes it visible from outside the frame (4).