Hydraulic control circuit

A hydraulic control circuit comprising:

• a first pressure regulating valve for regulating a discharge pressure of an oil pump;
• a second pressure regulating valve for adjusting an output hydraulic pressure of the first pressure regulating valve to a supply pressure to an input-side oil passage of a hydraulic drive device which is hydraulically controlled;
• a first oil passage that connects an output port of the first pressure regulating valve and the input-side oil passage;
• said second pressure regulating valve having:
• an input port connected to a connection section of the first oil passage and the input-side oil passage through a second oil passage;
• a drive port connected to the first oil passage through a third oil passage;
• a valve element axially displaced according to a drive pressure inputted into the drive port;
• and
• an output port;
• and
• said second pressure regulating valve being configured to regulate the supply pressure by controlling a flow rate between the input port and the output port of the second pressure regulating valve by the valve element axially displaced according to the drive pressure applied at the drive port,
• wherein a connection section of the first oil passage and the third oil passage is provided on a side of the first pressure regulating valve from the connection section of the first oil passage and the second oil passage, and
• wherein a throttle is provided in the first oil passage between the connection section of the first oil passage and the second oil passage and the connection section of the first oil passage and the third oil passage.