An ink cartridge mountable to a cartridge mounting portion provided with an ink receiving tube, an electrical connecting portion and a locking lever, in a mounting direction crossing with a direction of gravity, said ink cartridge comprising: a casing including an ink accommodating chamber configured to accommodate ink to be supplied to the ink receiving tube, said casing including a front surface at a leading side with respect to the mounting direction, an upper surface and a bottom surface; a tube inserting portion into which the ink receiving tube is insertable and which is provided at said front surface in a position closer to said bottom surface than to said upper surface; an electrical contact electrically connectable to the electrical connecting portion and provided in a position above said tube inserting portion, said electrical contact including an area crossing with the mounting direction; and an engaging portion provided in a position closer to said electrical contact than to said tube inserting portion, said engaging portion being engageable with the locking lever to maintain a inserted state in which the ink receiving tube is inserted in said tube inserting portion and a connected state in which said electrical contact is connected with the electrical connecting portion, characterized by further comprising a force receiving portion capable of receiving, from an urging spring provided in the cartridge mounting portion, the urging force for urging said ink cartridge in a dismounting direction which is opposite to the mounting direction, said force receiving portion being provided in a position above said tube inserting portion and below said electrical contact, wherein said engaging portion is engageable with said locking lever to maintain the inserted state and the connected state against the urging force. a casing including an ink accommodating chamber configured to accommodate ink to be supplied to the ink receiving tube, said casing including a front surface at a leading side with respect to the mounting direction, an upper surface and a bottom surface; a tube inserting portion into which the ink receiving tube is insertable and which is provided at said front surface in a position closer to said bottom surface than to said upper surface; an electrical contact electrically connectable to the electrical connecting portion and provided in a position above said tube inserting portion, said electrical contact including an area crossing with the mounting direction; and an engaging portion provided in a position closer to said electrical contact than to said tube inserting portion, said engaging portion being engageable with the locking lever to maintain a inserted state in which the ink receiving tube is inserted in said tube inserting portion and a connected state in which said electrical contact is connected with the electrical connecting portion, characterized by further comprising a force receiving portion capable of receiving, from an urging spring provided in the cartridge mounting portion, the urging force for urging said ink cartridge in a dismounting direction which is opposite to the mounting direction, said force receiving portion being provided in a position above said tube inserting portion and below said electrical contact, wherein said engaging portion is engageable with said locking lever to maintain the inserted state and the connected state against the urging force.