An device for sustained release of liquid according to the present invention includes: an outer pouch-shaped elastic member 2 an inner pouch-shaped elastic member placed inside the outer pouch-shaped elastic member and capable of being inflated a liquid-holding section 3 holding liquid between the inner pouch-shaped elastic member and the outer pouch-shaped elastic member and minute holes provided for the outer pouch-shaped elastic member, the diameter of the minute holes being changed by inflation and deflation.
