A rotary-type filling machine comprising: a rotary body rotatable about a rotation central axis; a liquid distribution chamber (3, 3A) installed at the rotary body and configured to store a liquid supplied from the outside; a plurality of filling flow path configuration units (8, 8A) arranged about the rotation central axis in the rotary body, each of which has a fluid path constituted by a liquid path connected to the liquid distribution chamber (3, 3A) and a liquid valve installed at the liquid path and configured to individually introduce the liquid into a container; a filling control device configured to control the respective liquid valves and control a filling quantity of the liquid with respect to the container; a liquid supply unit installed at a fixing section and configured to supply the liquid into the liquid distribution chamber (3, 3A); characterized in that the rotary-type filling machine further comprises: a pressure difference information detection unit configured to detect pressure difference information between a liquid distribution chamber pressure, which is a pressure of the liquid in the liquid distribution chamber (3, 3A), and a filling atmospheric pressure detected as a pressure of a flow release unit in the filling flow path configuration unit (8, 8A) at an arbitrary radial direction position of the rotary body, and a rotation information detection unit configured to detect rotation information of the rotary body, wherein the filling control device calculates a flow rate of the liquid flowing out of a liquid outlet of the liquid path based on the detected pressure difference information, rotation information and a previously obtained relationship between the pressure difference information and rotation information and the flow rate of the liquid flowing out of the liquid outlet of the liquid path, and controls a filling quantity of the liquid with respect to the container. a rotary body rotatable about a rotation central axis; a liquid distribution chamber (3, 3A) installed at the rotary body and configured to store a liquid supplied from the outside; a plurality of filling flow path configuration units (8, 8A) arranged about the rotation central axis in the rotary body, each of which has a fluid path constituted by a liquid path connected to the liquid distribution chamber (3, 3A) and a liquid valve installed at the liquid path and configured to individually introduce the liquid into a container; a filling control device configured to control the respective liquid valves and control a filling quantity of the liquid with respect to the container; a liquid supply unit installed at a fixing section and configured to supply the liquid into the liquid distribution chamber (3, 3A); characterized in that the rotary-type filling machine further comprises: a pressure difference information detection unit configured to detect pressure difference information between a liquid distribution chamber pressure, which is a pressure of the liquid in the liquid distribution chamber (3, 3A), and a filling atmospheric pressure detected as a pressure of a flow release unit in the filling flow path configuration unit (8, 8A) at an arbitrary radial direction position of the rotary body, and a rotation information detection unit configured to detect rotation information of the rotary body, wherein the filling control device calculates a flow rate of the liquid flowing out of a liquid outlet of the liquid path based on the detected pressure difference information, rotation information and a previously obtained relationship between the pressure difference information and rotation information and the flow rate of the liquid flowing out of the liquid outlet of the liquid path, and controls a filling quantity of the liquid with respect to the container. a pressure difference information detection unit configured to detect pressure difference information between a liquid distribution chamber pressure, which is a pressure of the liquid in the liquid distribution chamber (3, 3A), and a filling atmospheric pressure detected as a pressure of a flow release unit in the filling flow path configuration unit (8, 8A) at an arbitrary radial direction position of the rotary body, and a rotation information detection unit configured to detect rotation information of the rotary body, wherein the filling control device calculates a flow rate of the liquid flowing out of a liquid outlet of the liquid path based on the detected pressure difference information, rotation information and a previously obtained relationship between the pressure difference information and rotation information and the flow rate of the liquid flowing out of the liquid outlet of the liquid path, and controls a filling quantity of the liquid with respect to the container.