A printer comprising: a feed roller configured to feed a print medium; a print head (28, 28A) configured to pinch the print medium with the feed roller and to print on the print medium; and a biasing member configured to bias the print head (28, 28A) in a first direction toward the feed roller, wherein the print head (28, 28A) is movable in the first direction between a first position and a second position, the first position being a position at which the print head (28, 28A) can be removed when moved in a second direction, the second position being a position at which the print head (28, 28A) cannot be removed when moved in the second direction, wherein the print head (28, 28A) comprises: a base on which heating elements are mounted; and a pair of shafts that extend outward from both ends of the base, the printer further comprises a pair of grooves that receives the pair of shafts, the pair of grooves including a first groove and a second groove, the first groove extending in the second direction from the first position, the second groove extending in the first direction from the first position to the second position, characterized in that the print medium includes a liner and labels releasably attached on the liner, peeling issuing and continuous issuing can be switched in the printer, peeling issuing allowing the labels to be issued after being peeled from the liner of the print medium, continuous issuing allowing the labels to be issued without being peeled from the liner, the printer further comprises a peeling unit configured to hold a peeling roller that faces the feed roller in peeling issuing, the peeling unit being movable between a closed position and an open position, the closed position being a position at which the peeling unit at least partly covers the print head (28, 28A), the open position being a position at which the peeling unit does not cover the print head (28, 28A), and when the peeling unit is at the open position and the pair of shafts is at the first position, space for allowing mounting and removing the print head (28, 28A) is formed. a feed roller configured to feed a print medium; a print head (28, 28A) configured to pinch the print medium with the feed roller and to print on the print medium; and a biasing member configured to bias the print head (28, 28A) in a first direction toward the feed roller, wherein the print head (28, 28A) is movable in the first direction between a first position and a second position, the first position being a position at which the print head (28, 28A) can be removed when moved in a second direction, the second position being a position at which the print head (28, 28A) cannot be removed when moved in the second direction, the print head (28, 28A) comprises: a base on which heating elements are mounted; and a pair of shafts that extend outward from both ends of the base, the printer further comprises a pair of grooves that receives the pair of shafts, the pair of grooves including a first groove and a second groove, the first groove extending in the second direction from the first position, the second groove extending in the first direction from the first position to the second position, characterized in that the print medium includes a liner and labels releasably attached on the liner, peeling issuing and continuous issuing can be switched in the printer, peeling issuing allowing the labels to be issued after being peeled from the liner of the print medium, continuous issuing allowing the labels to be issued without being peeled from the liner, the printer further comprises a peeling unit configured to hold a peeling roller that faces the feed roller in peeling issuing, the peeling unit being movable between a closed position and an open position, the closed position being a position at which the peeling unit at least partly covers the print head (28, 28A), the open position being a position at which the peeling unit does not cover the print head (28, 28A), and when the peeling unit is at the open position and the pair of shafts is at the first position, space for allowing mounting and removing the print head (28, 28A) is formed.