A liquid supply device comprising a mounting portion and a liquid cartridge configured to be inserted into the mounting portion in a first direction via an opening against an urging force directed in a second direction opposite the first direction and thereby to be mounted to the mounting portion, wherein the liquid cartridge comprises: a liquid chamber configured to store liquid therein; a front face facing the first direction when the liquid cartridge is inserted into the mounting portion; a rear face , wherein the liquid chamber is positioned between the front face and the rear face; a particular face extending between the front face and the rear face; a liquid supply portion positioned at the front face; a lock surface positioned at the particular face; and a recess which is open in the second direction, and the mounting portion comprises: a lock portion configured to contact the lock surface; a cover configured to pivot between an open attitude and a close attitude and comprising a protrusion , wherein when the cover is in the open attitude, the cover does not cover the opening, such that the opening is exposed, and when the cover is in the close attitude, the cover covers the opening, wherein the mounting portion comprises a liquid supply tube configured to be inserted into the liquid supply portion; wherein the liquid cartridge is configured to pivot between a first attitude and a second attitude when the liquid cartridge is inserted into the mounting portion and the liquid supply tube is inserted into the liquid supply portion, wherein when the liquid cartridge is in the first attitude, the lock surface and the lock portion face each other in the first direction and the second direction, and the lock surface contacts the lock portion in the second direction, such that movement of the liquid cartridge relative to the mounting portion in the second direction is restricted, wherein when the liquid cartridge is in the second attitude, the lock surface and the lock portion do not face each other in the first direction and the second direction, wherein when the liquid cartridge is in the first attitude and the cover is in the close attitude, the protrusion of the cover is positioned in the recess of the liquid cartridge and restricts movement of the liquid cartridge toward the second attitude, wherein when the liquid cartridge is in the second attitude and the cover pivots from the open attitude toward the close attitude, the protrusion contacts the liquid cartridge during pivotal moment of the cover from the open attitude toward the close attitude. a liquid chamber configured to store liquid therein; a front face facing the first direction when the liquid cartridge is inserted into the mounting portion; a rear face , wherein the liquid chamber is positioned between the front face and the rear face; a particular face extending between the front face and the rear face; a liquid supply portion positioned at the front face; a lock surface positioned at the particular face; and a recess which is open in the second direction, and a lock portion configured to contact the lock surface; a cover configured to pivot between an open attitude and a close attitude and comprising a protrusion , wherein when the cover is in the open attitude, the cover does not cover the opening, such that the opening is exposed, and when the cover is in the close attitude, the cover covers the opening, <EOS>