A canister type thruster (100; 200; 300; 400) mounted in a trunk of a ship, comprising a rack (141; 245) installed on an outer surface of the canister (110; 410) in parallel with a lifting direction and provided with a lateral portion (141a; 245a) and toothed parts (141b; 245b) on opposite sides of said rack; a lift unit (140; 240) that is located opposite to the rack (141; 245) and moves the rack in the upward or downward direction, wherein the lift unit includes pinions (142, 242) that are located opposite to the toothed parts (141b; 245b) of the rack and are engaged with the toothed parts of the rack (141b; 245b); and at least one guide module configured to guide upward/downward movement of a canister; characterized in that the guide module includes: a lower guide unit (160; 260b; 560) that is mounted at a lower portion of the trunk facing the rack (141; 245) and guides the rack (141; 245) in a downward direction of the trunk when the canister (110; 410) moves down; an upper guide unit (160; 260; 260a; 560) that is mounted at an upper portion of the trunk facing the rack (141; 245) and guides the rack (141; 245) in an upward direction of the trunk when the canister (110; 410) moves up; wherein each of the lower and upper guide units (160; 260; 260a, 260b; 560) is facing the rack (141; 245) and includes: a guide bracket that is mounted on the trunk; a lateral guide pad that is provided on the guide bracket to face the lateral portion (141a; 245a) of the rack (141; 245); and toothed-part guide pads that are provided on the guide bracket in pair so as to face the toothed parts (141b; 245b) of the rack (141; 245), and the lift unit (140; 240) is located between the lower and upper guide units, and includes further a lift guide pad that is located opposite to the lateral portion (141a; 245a) of the rack. a lower guide unit (160; 260b; 560) that is mounted at a lower portion of the trunk facing the rack (141; 245) and guides the rack (141; 245) in a downward direction of the trunk when the canister (110; 410) moves down; an upper guide unit (160; 260; 260a; 560) that is mounted at an upper portion of the trunk facing the rack (141; 245) and guides the rack (141; 245) in an upward direction of the trunk when the canister (110; 410) moves up; wherein each of the lower and upper guide units (160; 260; 260a, 260b; 560) is facing the rack (141; 245) and includes: a guide bracket that is mounted on the trunk; a lateral guide pad that is provided on the guide bracket to face the lateral portion (141a; 245a) of the rack (141; 245); and toothed-part guide pads that are provided on the guide bracket in pair so as to face the toothed parts (141b; 245b) of the rack (141; 245), a guide bracket that is mounted on the trunk; a lateral guide pad that is provided on the guide bracket to face the lateral portion (141a; 245a) of the rack (141; 245); and toothed-part guide pads that are provided on the guide bracket in pair so as to face the toothed parts (141b; 245b) of the rack (141; 245), and the lift unit (140; 240) is located between the lower and upper guide units, and includes further a lift guide pad that is located opposite to the lateral portion (141a; 245a) of the rack.