A liquid container detachably mountable to a mounting portion (105, 150, 405, 415, 450, 505) of an inkjet recording apparatus, the mounting portion having an electrical contact portion (152, 452, 552), a first locking portion (155, 455) and a second locking portion (156, 456), said liquid container comprising: a casing for containing liquid; a first engaging portion (5, 305) provided on a first side of said casing and engageable with the first locking portion; a latching lever (3, 303) elastically deformable toward a second side of said casing which is opposite the first side and having a second engaging portion (6, 306) engageable with the second locking portion (156, 456); a supply port (7, 307) provided at a third side of said casing and capable of supplying the liquid to an ink jet head; the liquid container further comprising an electrical contact (102, 402) electrically contactable to the electrical contact portion (152, 452, 552); a memory electrically connectable to said electrical contact and capable of storing information relating to said liquid container, wherein the information is capable of being transmitted to the inkjet recording apparatus through said electrical contact and is capable of being transmitted from the inkjet recording apparatus through said electrical contact; a substrate provided with said memory and said electrical contact; and wherein said electrical contact (102, 402) is located adjacent to said second side and said third side and is inclined relative to said second side and said third side, and wherein said second engaging portion(6, 306) and said electrical contact portion (152, 452, 552) are configured and positioned such that, by a rotation of said liquid container caused by downwardly pushing said liquid container in a state that said first engaging portion (5, 305) is engaged with the first locking portion (155, 455), (i) said second engaging portion (6, 306) is engaged with the second locking portion (156, 456) and (ii) said electrical contact (102, 402) is electrically connected with the electrical contact portion (152, 452, 552). a casing for containing liquid; a first engaging portion (5, 305) provided on a first side of said casing and engageable with the first locking portion; a latching lever (3, 303) elastically deformable toward a second side of said casing which is opposite the first side and having a second engaging portion (6, 306) engageable with the second locking portion (156, 456); a supply port (7, 307) provided at a third side of said casing and capable of supplying the liquid to an ink jet head; the liquid container further comprising an electrical contact (102, 402) electrically contactable to the electrical contact portion (152, 452, 552); a memory electrically connectable to said electrical contact and capable of storing information relating to said liquid container, wherein the information is capable of being transmitted to the inkjet recording apparatus through said electrical contact and is capable of being transmitted from the inkjet recording apparatus through said electrical contact; a substrate provided with said memory and said electrical contact; and wherein said electrical contact (102, 402) is located adjacent to said second side and said third side and is inclined relative to said second side and said third side, and wherein said second engaging portion(6, 306) and said electrical contact portion (152, 452, 552) are configured and positioned such that, by a rotation of said liquid container caused by downwardly pushing said liquid container in a state that said first engaging portion (5, 305) is engaged with the first locking portion (155, 455), (i) said second engaging portion (6, 306) is engaged with the second locking portion (156, 456) and (ii) said electrical contact (102, 402) is electrically connected with the electrical contact portion (152, 452, 552).