Patent ID: 7192127

Claim:
An ink cartridge containing liquid inside thereof, comprising: an ink storing portion for storing ink to be supplied to an ink jet head; an elastic member having a slit through/from which a liquid supply needle disposed to a beginning end of route for supplying ink to said ink jet head is repeatedly inserted/pulled out; and a casing to which the elastic member is mounted, wherein a concave portion which guides said liquid supply needle into said slit is formed in said elastic member and said elastic member has a portion in which a projection shape of an opening portion of said concave portion seen in an inserting/pulling-out direction of said liquid supply needle into/from said slit is larger than a needle projection shape as a projection shape of an exterior of said liquid supply needle seen in said inserting/pulling-out direction and a projection shape of a bottom portion of said concave portion is smaller than said needle projection shape, wherein said elastic member including a main body portion disposed inside of said casing, having an outer diameter smaller than an inner diameter of said casing; and a supporting fixing portion formed to an entire circumference of said main body portion in a brim-shape, having a diameter larger than that of the main body portion, wherein a surface to which said slit is formed, of said bottom portion of said concave portion of said main body portion is spaced from a surface abutted to said casing, of said supporting fixing portion at a predetermined distance in a direction in which said liquid supply needles is inserted into said slit, wherein said elastic member is mounted in a manner that said supporting fixing portion is pressedly sandwiched by said pressing member and an end portion of said casing.