A liquid supply device includes: a de-foaming chamber for removing air bubbles mixed in liquid; a liquid flow path which supplies the liquid to the de-foaming chamber; a filter section provided in the liquid flow path and having an introduction portion for introducing the liquid and a discharge portion for discharging the liquid, where the discharge portion is disposed at a position with a height equal to or more than that of the introduction portion in the vertical direction; and a pressurizing section for supplying the pressurized liquid to the filter section.