An object of the present invention is to provide a liquid bag that makes bubbling possible with a simple structure without increasing the number of parts.The liquid bag according to the present invention includes: a bag main body for containing a liquid, the bag main body constructed of a flexible thermoplastic resin sheet; and a mouth member constructed of a thermoplastic resin, the mouth member sealingly bonded to a part of a periphery of the bag main body. The mouth member has a sleeve-like seal portion sealingly bonded to the bag main body, the seal portion including a first flow path and a second flow path. The first flow path opens and extends along the periphery of the bag main body and the second flow path opens at a bottom surface of the seal portion to an inside of the bag main body.