A holding mechanism includes: a holding plate capable of holding an electronic device for an electric vehicle; a leg portion supporting two long sides of the holding plate; first and second fixing portions provided in the leg portion and separated from each other in a short direction of the holding plate; and a third fixing portion located at or near one of two sides of the holding plate along the short direction and located higher than the first and second fixing portions, wherein the first and second fixing portions can be respectively fixed to first and second mount parts provided in a vehicle body structural member at a front side of the electric vehicle and separated from each other in a width direction or front-rear direction of the electric vehicle, and the third fixing portion can be fixed to a third mount part provided in the vehicle body structural member.