In an oil tank for a hydraulic power unit, the present invention is integrally injected with synthetic resin so that hydraulic oil is stored therein, including a bottom plate 11 and a side plate 12 extending upward from the edge of the bottom plate 11. Molded oil tank body (10); and a metal cover coupled to the upper end of the side plate 12 of the oil tank body 10 and to which the hydraulic pressure generating unit 30 that pumps the hydraulic oil of the oil tank body 10 and supplies it to the hydraulic operating element is coupled to the upper surface. plate 20; and a flange 13 is integrally provided on the upper end of the side plate 12 of the oil tank body 10, and the cover plate 20 and the upper surface of the flange 13 are A plurality of bolt holes spaced apart from each other are fastened with a packing groove 14 to which the packing 40 interposed between the bolts 50 for fixing the cover plate 20 to the oil tank body 10 is fastened. (15) is an oil tank for a hydraulic power unit, characterized in that it is formed.
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