This paper proposes new assistive functions for the joystick of electric wheelchairs in order to reduce some difficulties in the early stage of training. The functions are implemented as three modes, and each mode restricts driving duration or directions of the electric wheelchair. These functions prevent the wheelchair from running out of control, and ensure the safety of the user. Three children who have multiple disabilities without any experience of driving an electric wheelchair were asked to drive the electric wheelchair at their schools. As a result, the assistive functions are effective to the improvement of driving abilities. Additionally, it is found that the electric wheelchair is useful for the teachers because the restriction of driving duration enables to drive it at narrow space. Furthermore, the results give suggestions that the electric wheelchair is available as educational aids of sensory integrations of multiple disabled children.