Provided is a heater for a motor vehicle including: a heat source part: a heat source part rod including a rod sidewall and a rod cover in order to receive the heat source part; a first heat radiating plate including a first heat generation region in which one side of the heat source part is disposed and a first air movement region in which at least one or more first through-holes are formed; and a second heat radiating plate including a second heat generation region in which the other side of the heat source part is disposed and a second air movement region in which at least one or more second through-holes are formed. Particularly, the heat source part is disposed between the first and second heat radiating plates, and the rod sidewall is provided integrally with the first heat radiating plate.