A hydraulic control apparatus is disclosed which includes: a base body; and a housing to be fixed to one surface of the base body. The housing includes an opening facing the one surface of the base body. The opening includes a flange portion formed on and projected outwardly from an opening edge portion. The flange portion includes a screw-formed housing fixing hole for fixing the housing to the base body using a fastening member and a reference hole for provisionally fixing the housing when assembling parts to the housing. The reference hole is formed by lightening the flange portion and arranged parallel to the housing fixing hole.