A terminal connection structure for connecting a second terminal fixture to a first terminal fixture which is connected to a power device, said terminal connection structure comprising: a base having a bottom wall; a terminal holder that can hold the first and second terminal fixtures (3, 4) in an overlapping state; and a mobile attachment section having a parallel wall that is provided on une the terminal holder and that is parallel to the bottom wall, and a holding slit that is provided to the base, is entered by the parallel wall, and is larger than the parallel wall, and attaching the terminal holder to the base movably and parallel to a surface of the bottom wall, characterized by further comprising a press fixing member configured to be attached to the base, wherein the press fixing member is configured to be abut on a connecting section connected to the power device of the first terminal fixture, and to push the connecting section toward the bottom wall when attached to the base, wherein the terminal holder includes a bottom plate section as a parallel wall, a pair of extended pillars extending vertically from the bottom plate section and being parallel to each other with a gap between each other, and a supporting piece on which the connecting section of the first terminal fixture is to be placed, wherein one of the pair of extended pillars includes a through-hole through which the second terminal fixture is to be passed, and another one of the pair of extended pillars includes a slit in which the first terminal fixture is to be received, and wherein the support piece is extending from the another one of the pair of extended pillars in a direction away from the one of the pair of extended pillars. a base having a bottom wall; a terminal holder that can hold the first and second terminal fixtures (3, 4) in an overlapping state; and a mobile attachment section having a parallel wall that is provided on une the terminal holder and that is parallel to the bottom wall, and a holding slit that is provided to the base, is entered by the parallel wall, and is larger than the parallel wall, and attaching the terminal holder to the base movably and parallel to a surface of the bottom wall, characterized by further comprising a press fixing member configured to be attached to the base, wherein the press fixing member is configured to be abut on a connecting section connected to the power device of the first terminal fixture, and to push the connecting section toward the bottom wall when attached to the base, wherein the terminal holder includes a bottom plate section as a parallel wall, a pair of extended pillars extending vertically from the bottom plate section and being parallel to each other with a gap between each other, and a supporting piece on which the connecting section of the first terminal fixture is to be placed, wherein one of the pair of extended pillars includes a through-hole through which the second terminal fixture is to be passed, and another one of the pair of extended pillars includes a slit in which the first terminal fixture is to be received, and wherein the support piece is extending from the another one of the pair of extended pillars in a direction away from the one of the pair of extended pillars.