Branch adaptor

A branch adaptor comprising:

• a housing;
• and
• a plurality of terminals held by the housing, wherein
• the housing includes:
• a first mating recess opening in a first opening direction perpendicular to a terminal arrangement direction in which the plurality of terminals is arranged;
• a plurality of second mating recesses opening in a second opening direction opposite to the first opening direction;
• a plurality of projection portions;
• and
• a plurality of grooves,
• each of the plurality of terminals includes:
• a first contact portion extending in the first opening direction in the first mating recess;
• and
• a plurality of second contact portions extending in the second opening direction in the plurality of second mating recesses, respectively,
• the plurality of the projection portions is provided spaced apart from one another between the terminals adjacent to each other in the terminal arrangement direction, and each of the plurality of projection portions is configured to protrude in the first opening direction from an inner surface, which is orthogonal to the first opening direction, of the first mating recess along the first contact portion in the first mating recess, and
• the plurality of the grooves is provided on two sides of each of the plurality of the projection portions in a thickness direction perpendicular to the terminal arrangement direction and the first opening direction, and spaced apart from one another between the terminals adjacent to each other in the terminal arrangement direction.