An image recording apparatus comprising: a carriage configured to move in a left-and-right direction along a recording surface of a recording medium; a recording head mounted to the carriage and having nozzles formed therein, wherein the recording head is configured to eject liquid droplets though the nozzles; a conveying mechanism (60, 62) configured to convey the recording medium along a conveying path to a position below the carriage with respect to an up-and-down direction; a liquid cartridge comprising a liquid chamber configured to store liquid therein; a cartridge mounting portion positioned further forward than the nozzles of the recording head with respect to a front-and-rear direction and positioned to the right of the conveying path with respect to the left-and-right direction, wherein the cartridge mounting portion is configured to receive the liquid cartridge; and a tube connecting the cartridge mounting portion and the recording head, through which liquid can flow between the cartridge mounting portion and the recording head, wherein the liquid cartridge comprises: a supply opening which is open at an outer surface of the liquid cartridge and is configured to supply the liquid stored in the liquid chamber to the tube; a connection opening formed at a lower portion of the liquid chamber with respect to the up-and-down direction, when the liquid cartridge is mounted to the cartridge mounting portion; a liquid path connecting the liquid chamber and the supply opening via the connection opening; and an atmosphere communication portion configured to bring the liquid chamber into communication with the atmosphere outside the liquid cartridge, wherein when the liquid cartridge is mounted to the cartridge mounting portion, the connection opening is positioned at a front portion of the liquid chamber with respect to the front-and-rear direction and at a right portion of the liquid chamber with respect to the left-and-right direction. a carriage configured to move in a left-and-right direction along a recording surface of a recording medium; a recording head mounted to the carriage and having nozzles formed therein, wherein the recording head is configured to eject liquid droplets though the nozzles; a conveying mechanism (60, 62) configured to convey the recording medium along a conveying path to a position below the carriage with respect to an up-and-down direction; a liquid cartridge comprising a liquid chamber configured to store liquid therein; a cartridge mounting portion positioned further forward than the nozzles of the recording head with respect to a front-and-rear direction and positioned to the right of the conveying path with respect to the left-and-right direction, wherein the cartridge mounting portion is configured to receive the liquid cartridge; and a tube connecting the cartridge mounting portion and the recording head, through which liquid can flow between the cartridge mounting portion and the recording head, wherein the liquid cartridge comprises: a supply opening which is open at an outer surface of the liquid cartridge and is configured to supply the liquid stored in the liquid chamber to the tube; a connection opening formed at a lower portion of the liquid chamber with respect to the up-and-down direction, when the liquid cartridge is mounted to the cartridge mounting portion; a liquid path connecting the liquid chamber and the supply opening via the connection opening; and an atmosphere communication portion configured to bring the liquid chamber into communication with the atmosphere outside the liquid cartridge, wherein when the liquid cartridge is mounted to the cartridge mounting portion, the connection opening is positioned at a front portion of the liquid chamber with respect to the front-and-rear direction and at a right portion of the liquid chamber with respect to the left-and-right direction. a supply opening which is open at an outer surface of the liquid cartridge and is configured to supply the liquid stored in the liquid chamber to the tube; a connection opening formed at a lower portion of the liquid chamber with respect to the up-and-down direction, when the liquid cartridge is mounted to the cartridge mounting portion; a liquid path connecting the liquid chamber and the supply opening via the connection opening; and an atmosphere communication portion configured to bring the liquid chamber into communication with the atmosphere outside the liquid cartridge, wherein when the liquid cartridge is mounted to the cartridge mounting portion, the connection opening is positioned at a front portion of the liquid chamber with respect to the front-and-rear direction and at a right portion of the liquid chamber with respect to the left-and-right direction.