A cooling device (100,200) comprising: a main body unit that has, on a surface thereof, a plurality of disposition regions (10; 10A, 10B, 10C, 10D) where an object to be cooled is disposed, wherein the object to be cooled includes local heat generating units, which are regions having a heat generation density higher than other portions of the entire object to be cooled; and a refrigerant flow passage provided in the main body unit, wherein the refrigerant flow passage includes a first flow passage portion (21; 121) that passes a position of overlapping a predetermined disposition region (10; 10A, 10B, 10C, 10D) out of the plurality of disposition regions (10; 10A, 10B, 10C, 10D) and a second flow passage portion (22; 122) that passes a position of overlapping the other disposition regions (10; 10A, 10B, 10C, 10D) other than the predetermined disposition region (10; 10A, 10B, 10C, 10D), the first flow passage portion (21; 121) is formed at a plurality of predetermined positions of overlapping a part of an inside of the predetermined disposition region (10; 10A, 10B, 10C, 10D) to allow a refrigerant to pass therethrough more intensively than the second flow passage portion (22; 122), the first flow passage portion (21; 121) is formed to branch off into a plurality of branched portions to correspond to the plurality of predetermined positions each overlapping a plurality of local heat generating units of the object to be cooled disposed in the predetermined disposition region (10; 10A, 10B, 10C, 10D) by guide wall portions (26, 27) provided so as to narrow the width of the refrigerant flow passage, and a total of the first flow passage widths of the respective branched portions is smaller than the second flow passage width. a main body unit that has, on a surface thereof, a plurality of disposition regions (10; 10A, 10B, 10C, 10D) where an object to be cooled is disposed, wherein the object to be cooled includes local heat generating units, which are regions having a heat generation density higher than other portions of the entire object to be cooled; and a refrigerant flow passage provided in the main body unit, wherein the refrigerant flow passage includes a first flow passage portion (21; 121) that passes a position of overlapping a predetermined disposition region (10; 10A, 10B, 10C, 10D) out of the plurality of disposition regions (10; 10A, 10B, 10C, 10D) and a second flow passage portion (22; 122) that passes a position of overlapping the other disposition regions (10; 10A, 10B, 10C, 10D) other than the predetermined disposition region (10; 10A, 10B, 10C, 10D), the first flow passage portion (21; 121) is formed at a plurality of predetermined positions of overlapping a part of an inside of the predetermined disposition region (10; 10A, 10B, 10C, 10D) to allow a refrigerant to pass therethrough more intensively than the second flow passage portion (22; 122), the first flow passage portion (21; 121) is formed to branch off into a plurality of branched portions to correspond to the plurality of predetermined positions each overlapping a plurality of local heat generating units of the object to be cooled disposed in the predetermined disposition region (10; 10A, 10B, 10C, 10D) by guide wall portions (26, 27) provided so as to narrow the width of the refrigerant flow passage, and a total of the first flow passage widths of the respective branched portions is smaller than the second flow passage width.