The invention provides a relief device for an oil circuit of an engine. The relief device includes: an oil pump (9); an upstream flow passage (61) provided from a discharge section side of the oil pump (9) to an engine (E); an oil-pressure relief valve (A) relieving oil by a valve body moving due to oil pressure; and a temperature-sensitive relief valve (B) relieving oil by detecting an oil temperature and opening and closing steplessly. The oil-pressure relief valve (A) and the temperature-sensitive relief valve (B) are disposed in parallel in the upstream flow passage (61). An oil filter (102) is provided in the upstream flow passage (61), and the temperature-sensitive relief valve (B) is positioned on the upstream side of the oil filter.