A bag sealing apparatus comprising: a bag support unit which supports a bag; a support drive unit which includes a first drive source and intermittently moves the bag support unit to position the bag at a sealing process position (Ps); a first sealing member and a second sealing member which are provided to be capable of opening and closing, and to perform a sealing process while nipping the bag by being placed in a closed position in a state where the bag is positioned in the sealing process position (Ps); a sealing drive unit which includes a second drive source provided separately from the first drive source, and is configured to open and close the first sealing member and the second sealing member; characterized in that the bag sealing apparatus further comprises: a vibration measurement device which is configured to measure vibration of at least one of the first sealing member and the second sealing member; and a determination device which is configured to determine quality of the sealing process according to a measurement result of the vibration measurement device from before the first sealing member and the second sealing member reach the closed position to after the first sealing member and the second sealing member reach the closed position, wherein the sealing drive unit is configured to cause relative movement between the first sealing member and the second sealing member from an open position at a moving speed determined according to a type of the bag, to place the first sealing member and the second sealing member in the closed position. a bag support unit which supports a bag; a support drive unit which includes a first drive source and intermittently moves the bag support unit to position the bag at a sealing process position (Ps); a first sealing member and a second sealing member which are provided to be capable of opening and closing, and to perform a sealing process while nipping the bag by being placed in a closed position in a state where the bag is positioned in the sealing process position (Ps); a sealing drive unit which includes a second drive source provided separately from the first drive source, and is configured to open and close the first sealing member and the second sealing member; characterized in that the bag sealing apparatus further comprises: a vibration measurement device which is configured to measure vibration of at least one of the first sealing member and the second sealing member; and a determination device which is configured to determine quality of the sealing process according to a measurement result of the vibration measurement device from before the first sealing member and the second sealing member reach the closed position to after the first sealing member and the second sealing member reach the closed position, wherein the sealing drive unit is configured to cause relative movement between the first sealing member and the second sealing member from an open position at a moving speed determined according to a type of the bag, to place the first sealing member and the second sealing member in the closed position. a vibration measurement device which is configured to measure vibration of at least one of the first sealing member and the second sealing member; and a determination device which is configured to determine quality of the sealing process according to a measurement result of the vibration measurement device from before the first sealing member and the second sealing member reach the closed position to after the first sealing member and the second sealing member reach the closed position, wherein the sealing drive unit is configured to cause relative movement between the first sealing member and the second sealing member from an open position at a moving speed determined according to a type of the bag, to place the first sealing member and the second sealing member in the closed position.