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. <EOS>