The disclosure provides a motor and a method for assembling the motor. The motor includes: a bus bar including a first portion of the bus bar and a second portion of the bus bar, the first portion of the bus bar and the second portion of the bus bar are defined separately; a first support component having a first support surface supporting the first abutting portion of the first portion of the bus bar toward the first direction; and a second support component having a second support surface supporting the second abutting portion of the second portion of the bus bar toward the first direction. The first portion of the bus bar further includes a first connecting portion, and the second portion of the bus bar further includes a second connecting portion. A distance between the first connecting portion and the second connecting portion is variable in the first direction.