Disclosed is a bag container (10) wherein a synthetic resin container body (11) having a barrel (12) equipped with a bottom (14) and a pouring port forming portion (13) is formed using a mold, and a pouring port is formed by breaking an easy-to-break portion (15) of the pouring port forming portion (13) thereby removing a predetermined cut-off portion (16). The pouring port forming portion (13) is provided to project upward from the barrel (12) perpendicularly to a mounting surface (P1) for the bottom (14). An unsealing knob piece (17) having a latch hole (24) for latching the tip of a fingeris provided to extend from one side of the pouring port forming portion (13). The latch hole (24) has such a shape as the tip of a finger is guided so as to be latched to a circumferential edge portion (24a) of the latch hole (24) from the inside, toward the circumferential direction (L) around the end (15a) of the easy-to-break portion (15), when the easy-to-break portion (15) is broken.