Erroneous operation prevention structure of combination switch

An erroneous operation prevention structure of a combination switch (10) includes a shaft, fixed to a steering column, a first moving knob (13), angularly moved relative to the shaft to switch a first circuit, a second moving knob (14), disposed adjacent to the first moving knob (13) coaxially, and angularly moved relative to the shaft to switch a second circuit, and an impingement prevention member (19), provided between the first moving knob (13) and the second moving knob (14). The impingement prevention member (19) prevents an axial movement of the first moving knob (13) toward the second moving knob (14).