Abstract: A trim assembly adapted to be mounted in an engaged assembly includes a spring fixing part and a first contact spring. The spring fixing part protrudes from a trim base of the trim assembly and adapted to be inserted into a containing part of the engaged assembly. The first contact spring is connected to the spring fixing part and adapted to abut on an inner wall of the containing part. The first contact spring includes a connecting part, an abutting part, and an extending arm. The connecting part is connected to the spring fixing part. The abutting part bends from a terminal of the connecting part and extends to form a first abutting face. The extending arm has a second abutting face and extends from a side of the first abutting face.