A joystick lever assembly includes: a base part; an operation part that is mounted on a first side plate of the base part and has rotary elements rotated with respect to each of forward, backward, leftward, and rightward directions by a joystick lever; a first connector connected to one side of the operation part; a second connector connected to a central part of the operation part; a lock part including a lock lever unit that is mounted on the second side plate of the base part and performs a rotary motion in a forward/backward direction, and a lock member that performs a rectilinear motion in a rotary direction of the lock lever on the floor plate according to the rotary motion of the lock lever unit; and a first stopper and a second stopper coupled to the bottoms of the first connector and the second connector.