A liquid discharge device comprising: a mounting portion (61 to 66) to which a head (31 to 36) configured to discharge a liquid is mounted, and an arm (71 to 76) configured to move between a fixed position where the head mounted on the mounting portion is fixed in a first direction, a second direction, and a third direction, all of which are orthogonal to each other, with respect to the mounting portion, and a released position where the head is unfixed from the mounting portion, wherein the mounting portion is provided on a plate configured to maintain a distance between the head and a print medium, one end of the arm is fixed to the plate, the arm is configured to move between the fixed position and the released position by rotating around a shaft provided on the plate, and extending in an axial direction that is either one of the first direction and the second direction, the arm has a first pressing portion configured to press on the head from one direction in the third direction, and a second pressing portion configured to press on the head from one direction in an orthogonal direction that is either the other one of the first direction and the second direction, when the arm moves from the released position to the fixed position, and the liquid discharge device characterized in that it further comprises: a cap (41 to 46) configured to cover, from the other direction in the third direction, a nozzle surface provided on the head, and an elastic member (481 to 484) configured to urge the cap in one direction in the third direction, at a plurality of locations that is three or more locations, wherein the position where the first pressing portion presses on the head when the arm is positioned in the fixed position is positioned within a region of the head surrounded by the plurality of locations when viewed from the third direction, when the head is positioned in a position overlapping with the cap in the third direction. a mounting portion (61 to 66) to which a head (31 to 36) configured to discharge a liquid is mounted, and an arm (71 to 76) configured to move between a fixed position where the head mounted on the mounting portion is fixed in a first direction, a second direction, and a third direction, all of which are orthogonal to each other, with respect to the mounting portion, and a released position where the head is unfixed from the mounting portion, wherein the mounting portion is provided on a plate configured to maintain a distance between the head and a print medium, one end of the arm is fixed to the plate, the arm is configured to move between the fixed position and the released position by rotating around a shaft provided on the plate, and extending in an axial direction that is either one of the first direction and the second direction, the arm has a first pressing portion configured to press on the head from one direction in the third direction, and a second pressing portion configured to press on the head from one direction in an orthogonal direction that is either the other one of the first direction and the second direction, when the arm moves from the released position to the fixed position, and the liquid discharge device characterized in that it further comprises: a cap (41 to 46) configured to cover, from the other direction in the third direction, a nozzle surface provided on the head, and an elastic member (481 to 484) configured to urge the cap in one direction in the third direction, at a plurality of locations that is three or more locations, wherein the position where the first pressing portion presses on the head when the arm is positioned in the fixed position is positioned within a region of the head surrounded by the plurality of locations when viewed from the third direction, when the head is positioned in a position overlapping with the cap in the third direction. a cap (41 to 46) configured to cover, from the other direction in the third direction, a nozzle surface provided on the head, and an elastic member (481 to 484) configured to urge the cap in one direction in the third direction, at a plurality of locations that is three or more locations, wherein the position where the first pressing portion presses on the head when the arm is positioned in the fixed position is positioned within a region of the head surrounded by the plurality of locations when viewed from the third direction, when the head is positioned in a position overlapping with the cap in the third direction.