Housing and connector

A housing comprising:

• a housing portion;
• a cover portion;
• and
• an attachment structure,
• wherein the housing portion has a housing chamber and a housing opening opened in an upper surface of the housing chamber,
• the cover portion is configured to be attachable to the housing portion so as to close the housing opening,
• the attachment structure has an engagement groove and an engagement piece,
• the engagement groove is recessed in either one of the housing portion or the cover portion on each side thereof in a right-left direction,
• the engagement piece is provided on each side of the other one of the housing portion or the cover portion in the right-left direction, and is configured to be fitted in the engagement groove in a state of the housing opening being closed with the cover portion,
• the engagement groove has a first inner end surface and a second inner end surface, the first inner end surface is positioned on a front side of the engagement groove, and the second inner end surface is positioned on a back side of the engagement groove,
• the engagement piece has a first outer end surface and a second outer end surface, the first outer end surface is positioned on a front side of the engagement piece, and the second outer end surface is positioned on a back side of the engagement piece,
• at least the second inner end surface of the first and second inner end surfaces is an inner inclined surface inclined backward from up to down,
• at least the second outer end surface of the first and second outer end surfaces is an outer inclined surface inclined backward from the up to the down, and
• in a state of the housing opening being closed with the cover portion, at least a lower portion of the inner inclined surface of the second inner end surface and a lower portion of the outer inclined surface of the second outer end surface contact each other.