A head cover for an air cylinder that is configured to cover a head side end part of a cylinder tube, the head cover comprising: a port; and a flow rate controller, wherein the flow rate controller includes: a first flow path configured to communicate with the port and a cylinder chamber of the air cylinder; a first flow rate adjustment part disposed in the first flow path; a second flow path disposed in parallel with the first flow path; a second flow rate adjustment part disposed in the second flow path; a pilot check valve disposed in the second flow path, and connected in series with the second flow rate adjustment part; and a third flow rate adjustment part configured to supply and discharge pilot air to and from the pilot check valve, wherein, depending on a pressure of the pilot air, the pilot check valve switches between a state allowing passage of exhaust air discharged from the cylinder chamber, and a state preventing the passage of the exhaust air, and the third flow rate adjustment part is connected to the port. a head side end part of a cylinder tube, the head cover comprising: a port; and a flow rate controller, wherein the flow rate controller includes: a first flow path configured to communicate with the port and a cylinder chamber of the air cylinder; a first flow rate adjustment part disposed in the first flow path; a second flow path disposed in parallel with the first flow path; a second flow rate adjustment part disposed in the second flow path; a pilot check valve disposed in the second flow path, and connected in series with the second flow rate adjustment part; and a third flow rate adjustment part configured to supply and discharge pilot air to and from the pilot check valve, wherein, depending on a pressure of the pilot air, the pilot check valve switches between a state allowing passage of exhaust air discharged from the cylinder chamber, and a state preventing the passage of the exhaust air, and the third flow rate adjustment part is connected to the port. a port; and a flow rate controller, wherein the flow rate controller includes: a first flow path configured to communicate with the port and a cylinder chamber of the air cylinder; a first flow rate adjustment part disposed in the first flow path; a second flow path disposed in parallel with the first flow path; a second flow rate adjustment part disposed in the second flow path; a pilot check valve disposed in the second flow path, and connected in series with the second flow rate adjustment part; and a third flow rate adjustment part configured to supply and discharge pilot air to and from the pilot check valve, a first flow path configured to communicate with the port and a cylinder chamber of the air cylinder; a first flow rate adjustment part disposed in the first flow path; a second flow path disposed in parallel with the first flow path; a second flow rate adjustment part disposed in the second flow path; a pilot check valve disposed in the second flow path, and connected in series with the second flow rate adjustment part; and a third flow rate adjustment part configured to supply and discharge pilot air to and from the pilot check valve, wherein, depending on a pressure of the pilot air, the pilot check valve switches between a state allowing passage of exhaust air discharged from the cylinder chamber, and a state preventing the passage of the exhaust air, and the third flow rate adjustment part is connected to the port.