A liquid ejecting apparatus comprising: a liquid ejecting head including a liquid chamber which communicates with a nozzle through which liquid can be ejected onto a medium; a supply flow path having a first end connected to a liquid supply source and a second end connected to the liquid chamber; a first circulation flow path having a first end located upstream and a second end located downstream, the first end being connected to the liquid chamber and the second end being connected to a first connecting portion which is provided in the supply flow path; a supply pump provided upstream relative to the first connecting portion in the supply flow path, the supply pump being configured to supply the liquid from the liquid supply source in a downstream direction; a first pressure regulating valve provided between the first connecting portion and the liquid ejecting head in the supply flow path, the first pressure regulating valve being configured to open when a downstream pressure becomes lower than a predetermined pressure; a second pressure regulating valve provided in the first circulation flow path, the second pressure regulating valve being configured to close when an upstream pressure becomes lower than a predetermined pressure; a circulation pump provided downstream relative to the second pressure regulating valve in the first circulation flow path, the circulation pump being configured to circulate the liquid in a downstream direction; an opening mechanism configured to forcibly open the first pressure regulating valve; a second circulation flow path having a first end connected to a second connecting portion, which is provided downstream relative to the supply pump in the supply flow path, and a second end connected to a third connecting portion, which is provided upstream relative to the supply pump in the supply flow path; and a third pressure regulating valve provided in the second circulation flow path, the third pressure regulating valve being configured to open when a pressure in the second connecting portion becomes higher than a predetermined pressure. a liquid ejecting head including a liquid chamber which communicates with a nozzle through which liquid can be ejected onto a medium; a supply flow path having a first end connected to a liquid supply source and a second end connected to the liquid chamber; a first circulation flow path having a first end located upstream and a second end located downstream, the first end being connected to the liquid chamber and the second end being connected to a first connecting portion which is provided in the supply flow path; a supply pump provided upstream relative to the first connecting portion in the supply flow path, the supply pump being configured to supply the liquid from the liquid supply source in a downstream direction; a first pressure regulating valve provided between the first connecting portion and the liquid ejecting head in the supply flow path, the first pressure regulating valve being configured to open when a downstream pressure becomes lower than a predetermined pressure; a second pressure regulating valve provided in the first circulation flow path, the second pressure regulating valve being configured to close when an upstream pressure becomes lower than a predetermined pressure; a circulation pump provided downstream relative to the second pressure regulating valve in the first circulation flow path, the circulation pump being configured to circulate the liquid in a downstream direction; an opening mechanism configured to forcibly open the first pressure regulating valve; a second circulation flow path having a first end connected to a second connecting portion, which is provided downstream relative to the supply pump in the supply flow path, and a second end connected to a third connecting portion, which is provided upstream relative to the supply pump in the supply flow path; and a third pressure regulating valve provided in the second circulation flow path, the third pressure regulating valve being configured to open when a pressure in the second connecting portion becomes higher than a predetermined pressure.