| abstract |
A flow path sealing structure (10), which is disposed on a way of a flow path (16) formed by fusion bonding a pair of resin sheets (12 and 14) that are superimposed on each other, includes a widened portion (20) surrounded by a widened seal portion (22) formed by fusion bonding together the pair of resin sheets (12 and 14) around a periphery thereof, and one end and another end of which are in communication with the flow path (16), together with being formed to be wider than the flow path (16), and a weakly sealed portion (24) formed to extend in a widthwise direction in the widened portion (20), and which partitions the widened portion (20) in a liquid-tight and airtight manner into the one end and the other end, together with being capable of being opened by increasing an internal pressure of the widened portion (20). |