Terminal unit and first terminal

A terminal unit, comprising:

• a first terminal including a columnar connecting portion and a resin cap for covering a tip surface of the columnar connecting portion, the resin cap having a maximum outer diameter larger than that of the columnar connecting portion;
• and
• a second terminal including a tubular connecting portion resiliently deformable in a diameter expanding direction;
• the columnar connecting portion being assembled with the tubular connecting portion by being press-fit into the tubular connecting portion with the resin cap in the lead,
• the tubular connecting portion being expanded in diameter and deformed by the resin cap with the resin cap located in the tubular connecting portion, whereby a second contact point provided on an inner peripheral surface of the tubular connecting portion is pushed in a direction separating from a first contact point constituted by an outer peripheral surface of the columnar connecting portion, and
• the second contact point being pressed into contact with the first contact point by a resilient restoring force of the tubular connecting portion in a diameter reducing direction with the resin cap arranged to project from the tubular connecting portion toward a tip side in a press-fitting direction.