A walker apparatus is provided. The walker apparatus includes a base, a plurality of wheels, a connection bracket, a handle unit and an actuating unit. The wheels are connected to the base. The connection bracket pivots on the base. The handle unit is disposed on the connection bracket. The actuating unit is connected to the base and the connection bracket. The actuating unit moves the connection bracket between a getting-up orientation and a walking-assistance orientation relative to the base. The user can stand up from a sitting position using the walker apparatus without external assistance from other people.