An electric storage apparatus for mounting on a vehicle and outputting an energy for use in running of a vehicle, comprising: a first electric storage stack extending lengthwise in a first direction and including a plurality of electric storage elements that are placed side by side in the first direction; an electronic device used to control charge and discharge of the electric storage apparatus and located below the first electric storage stack; characterized by comprising a plurality of second electric storage stacks (11; 12; 13; 14) placed side by side in the first direction, a portion of each of the plurality of second electric storage stacks (11; 12; 13; 14) being located below the first electric storage stack, each of the plurality of second electric storage stacks (11; 12; 13; 14) extending lengthwise in a second direction orthogonal to the first direction, and including a plurality of electric storage elements that are placed side by side in the second direction; a plurality of ducts (51; 52; 53; 54) connected to the plurality of second electric storage stacks (11; 12; 13; 14), the plurality of ducts (51; 52; 53; 54) supplying a cooling medium to the plurality of second electric storage stacks (11; 12; 13; 14), respectively, and being located along the first electric storage stack in spaces between the first electric storage stack and the plurality of second electric storage stacks (11; 12; 13; 14); and a case for being fixed to a lower face of a floor panel of a vehicle accommodating the first electric storage stack, the plurality of second electric storage stacks (11; 12; 13; 14), the plurality of ducts (51; 52; 53; 54) and the electronic device. a first electric storage stack extending lengthwise in a first direction and including a plurality of electric storage elements that are placed side by side in the first direction; an electronic device used to control charge and discharge of the electric storage apparatus and located below the first electric storage stack; characterized by comprising a plurality of second electric storage stacks (11; 12; 13; 14) placed side by side in the first direction, a portion of each of the plurality of second electric storage stacks (11; 12; 13; 14) being located below the first electric storage stack, each of the plurality of second electric storage stacks (11; 12; 13; 14) extending lengthwise in a second direction orthogonal to the first direction, and including a plurality of electric storage elements that are placed side by side in the second direction; a plurality of ducts (51; 52; 53; 54) connected to the plurality of second electric storage stacks (11; 12; 13; 14), the plurality of ducts (51; 52; 53; 54) supplying a cooling medium to the plurality of second electric storage stacks (11; 12; 13; 14), respectively, and being located along the first electric storage stack in spaces between the first electric storage stack and the plurality of second electric storage stacks (11; 12; 13; 14); and a case for being fixed to a lower face of a floor panel of a vehicle accommodating the first electric storage stack, the plurality of second electric storage stacks (11; 12; 13; 14), the plurality of ducts (51; 52; 53; 54) and the electronic device.