The invention relates to a connecting component applied to an automobile body, in particular to a connecting part arranged in the side body of an automobile. The connecting part is connected and arranged in an inner cavity of the side body and comprises a first connecting part and a second connecting part, and a connecting plate is fixedly connected between the first connecting part and the second connecting part. Due to the arrangement of the structure, an instrument reinforcing beam, an automobile door hinge and the side body of the automobile are connected into a whole, the overall structural strength among the instrument reinforcing beam, the automobile door hinge and the side body of the automobile is effectively enhanced, and safety is improved when automobile collision happens.