An electronic ink cartridge (10, 20, 30), comprising: a tubular member (5, 5') including a hollow portion; a core member (11, 21, 31) disposed so as to extend outwardly from a distal end portion of the tubular member (5, 5') in a direction of a center axis of the tubular member (5, 5'); a pressure sensor, which is accommodated in the hollow portion of the tubular member (5, 5') and which senses pressure applied to the core member (11, 21, 31), wherein the pressure sensor comprises a coil; and a connection member (17, 27, 36, 38), which is disposed to interpose the pressure sensor between the connection member (17, 27, 36, 38) and the core member (11,21, 31) along the direction of the center axis and which locks the pressure sensor to the tubular member (5, 5') in the direction of the center axis, wherein the tubular member (5, 5') is configured from a first tubular member and a second tubular member as two separate members separate from each other in a direction of a center axis of the tubular member (5, 5'), characterized in that the pressure sensor is electrically coupled to the connection member (17, 27, 36, 38) in the direction of the center axis of the tubular member (5, 5') to sense the pressure applied to the core member (11, 21, 31); and in that it further comprises a connection terminal (172c, 173c), which is formed on a proximal end face of the connection member (17, 27, 36, 38) and from which an electric characteristic corresponding to the pressure sensed by the pressure sensor is extracted, wherein the coil is connected to the connection terminal (172c, 173c) at a recessed groove (174, 175) of the connection member (17, 27, 36, 38). a tubular member (5, 5') including a hollow portion; a core member (11, 21, 31) disposed so as to extend outwardly from a distal end portion of the tubular member (5, 5') in a direction of a center axis of the tubular member (5, 5'); a pressure sensor, which is accommodated in the hollow portion of the tubular member (5, 5') and which senses pressure applied to the core member (11, 21, 31), wherein the pressure sensor comprises a coil; and a connection member (17, 27, 36, 38), which is disposed to interpose the pressure sensor between the connection member (17, 27, 36, 38) and the core member (11,21, 31) along the direction of the center axis and which locks the pressure sensor to the tubular member (5, 5') in the direction of the center axis, wherein the tubular member (5, 5') is configured from a first tubular member and a second tubular member as two separate members separate from each other in a direction of a center axis of the tubular member (5, 5'), characterized in that the pressure sensor is electrically coupled to the connection member (17, 27, 36, 38) in the direction of the center axis of the tubular member (5, 5') to sense the pressure applied to the core member (11, 21, 31); and in that it further comprises a connection terminal (172c, 173c), which is formed on a proximal end face of the connection member (17, 27, 36, 38) and from which an electric characteristic corresponding to the pressure sensed by the pressure sensor is extracted, wherein the coil is connected to the connection terminal (172c, 173c) at a recessed groove (174, 175) of the connection member (17, 27, 36, 38).