An electric power converter comprising: a capacitor module having a first pair of positive and negative DC terminals (1424P, 1424N) formed by stacking flat plate conductors via a first insulator; and a power module having a second pair of positive and negative DC terminals (IT1P, IT1N) formed by stacking other flat plate conductors via a second insulator, said power module further including a plurality of power semiconductor elements each for converting DC power supplied from said second pair of said DC terminals (IT1P, 1T1N) into AC power; wherein: said first pair of said positive and negative DC terminals (1424P, 1424N) is constructed such that said associated flat plate conductors are bent in directions opposite to each other at a front end of said terminal pair, and has a first connection surface electrically connected to said second pair of said positive and negative DC terminals (IT1P, IT1N), at an end of any one of said bent conductors; said second pair of said positive and negative DC terminals (IT1P, IT1N) Is constructed such that said associated flat plate conductors are bent in directions opposite to each other at a front end of said terminal pair, and has a second connection surface electrically connected to said first pair of said positive and negative DC terminals (1424P, 1424N), at an end of any one of said bent conductors; and in a connection region between said first connection surface and said second connection surface, said first insulator and said second insulator overlap each other, characterized in that the first and the second insulator (1289, 1288) comprises a bent front end portion, and that the AC power is a three-phase AC power. a capacitor module having a first pair of positive and negative DC terminals (1424P, 1424N) formed by stacking flat plate conductors via a first insulator; and a power module having a second pair of positive and negative DC terminals (IT1P, IT1N) formed by stacking other flat plate conductors via a second insulator, said power module further including a plurality of power semiconductor elements each for converting DC power supplied from said second pair of said DC terminals (IT1P, 1T1N) into AC power; wherein: said first pair of said positive and negative DC terminals (1424P, 1424N) is constructed such that said associated flat plate conductors are bent in directions opposite to each other at a front end of said terminal pair, and has a first connection surface electrically connected to said second pair of said positive and negative DC terminals (IT1P, IT1N), at an end of any one of said bent conductors; said second pair of said positive and negative DC terminals (IT1P, IT1N) Is constructed such that said associated flat plate conductors are bent in directions opposite to each other at a front end of said terminal pair, and has a second connection surface electrically connected to said first pair of said positive and negative DC terminals (1424P, 1424N), at an end of any one of said bent conductors; and in a connection region between said first connection surface and said second connection surface, said first insulator and said second insulator overlap each other, characterized in that the first and the second insulator (1289, 1288) comprises a bent front end portion, and that the AC power is a three-phase AC power. said first pair of said positive and negative DC terminals (1424P, 1424N) is constructed such that said associated flat plate conductors are bent in directions opposite to each other at a front end of said terminal pair, and has a first connection surface electrically connected to said second pair of said positive and negative DC terminals (IT1P, IT1N), at an end of any one of said bent conductors; said second pair of said positive and negative DC terminals (IT1P, IT1N) Is constructed such that said associated flat plate conductors are bent in directions opposite to each other at a front end of said terminal pair, and has a second connection surface electrically connected to said first pair of said positive and negative DC terminals (1424P, 1424N), at an end of any one of said bent conductors; and in a connection region between said first connection surface and said second connection surface, said first insulator and said second insulator overlap each other, characterized in that the first and the second insulator (1289, 1288) comprises a bent front end portion, and that the AC power is a three-phase AC power.