Provided is a pressurized tank for which the residual pressure of a transport pipe does not leak to the pressurized tank side. A pressurized tank (A), used in a device (B) to intermittently feed a prescribed amount of powder to a transport pipe (7) in order to plug transport powder via compressed air using the transport pipe (7), comprises: a first pressurized chamber (6) that forms a pressure vessel structure and has a funnel-shaped upper partitioning member (3) having an opening in the center portion in the top and a funnel-shaped lower partitioning member (4) having an opening in the center portion in the bottom; a first check valve (9) that is disposed below the opening of the upper partitioning member (3) of the first pressurized chamber (6) so as to be vertically movable and that can close the opening of the upper partitioning member (3) by being raised by way of compressed air; a second check valve (10) that is disposed below the opening of the lower partitioning member (4) of the first pressurized chamber (6) so as to be vertically movable and that can close the opening of the lower partitioning member (4) by being raised by way of compressed air; and an elastic body (24) that biases the second check valve (10) upward.