According to an embodiment, a housing of a high-speed transmission connector fitted to a connector of a counterpart substrate via a frontage. The housing of the first aspect includes: a bottom plate forming a bottom of the frontage and being provided with at least one boss on a surface opposite to the frontage side; a pair of first side walls facing each other in a first direction with the frontage sandwiched therebetween; and a pair of second side walls facing each other in a second direction orthogonal to the first direction with the frontage sandwiched therebetween. The bottom plate is provided with first through holes for tolerance measurement having inner peripheral surfaces including side wall surfaces of the first side walls in the same planes and/or second through holes for tolerance measurement having inner peripheral surfaces including side wall surfaces of the second side walls in the same planes.