A power wiring device (1, 2) comprising: a plurality of circuit modules each including a first connector (21, 31, 41, 210, 310) and a second connector (22, 32, 42, 220, 320), the plurality of circuit modules including a first circuit module group and a second circuit module group; and a first wiring member and a second wiring member that respectively include a third connector and a fourth connector, and in which the third connector and the fourth connector are electrically connected to one another, wherein the plurality of circuit modules includes: an energy harvesting module (20, 20a, 20b, 200) as a circuit module that can output, from the first connector (21, 31, 41, 210, 310) and the second connector (22, 32, 42, 220, 320), electric power obtained through energy harvesting; and a load module (30, 30a, 30b, 300) as a circuit module that can consume electric power input from the first connector (21, 31, 41, 210, 310) and electric power input from the second connector (22, 32, 42, 220, 320); wherein the fourth connector of the first wiring member is mechanically and electrically attached to the second connector (22, 32, 42, 220, 320) of the circuit module of the first circuit module group, wherein the third connector of the second wiring member is mechanically and electrically attached to the first connector (21, 31, 41, 210, 310) of the circuit module of the second circuit module group, wherein the power wiring device (1, 2) further comprises a switching member including: a fifth connector that is mechanically and electrically attached to the third connector of the first wiring member; a sixth connector that is mechanically and electrically attached to the fourth connector of the second wiring member; and a switching part that can switch between electrical connection and electrical disconnection between the fifth connector and the sixth connector. a plurality of circuit modules each including a first connector (21, 31, 41, 210, 310) and a second connector (22, 32, 42, 220, 320), the plurality of circuit modules including a first circuit module group and a second circuit module group; and a first wiring member and a second wiring member that respectively include a third connector and a fourth connector, and in which the third connector and the fourth connector are electrically connected to one another, wherein the plurality of circuit modules includes: an energy harvesting module (20, 20a, 20b, 200) as a circuit module that can output, from the first connector (21, 31, 41, 210, 310) and the second connector (22, 32, 42, 220, 320), electric power obtained through energy harvesting; and a load module (30, 30a, 30b, 300) as a circuit module that can consume electric power input from the first connector (21, 31, 41, 210, 310) and electric power input from the second connector (22, 32, 42, 220, 320); wherein the fourth connector of the first wiring member is mechanically and electrically attached to the second connector (22, 32, 42, 220, 320) of the circuit module of the first circuit module group, wherein the third connector of the second wiring member is mechanically and electrically attached to the first connector (21, 31, 41, 210, 310) of the circuit module of the second circuit module group, wherein the power wiring device (1, 2) further comprises a switching member including: a fifth connector that is mechanically and electrically attached to the third connector of the first wiring member; a sixth connector that is mechanically and electrically attached to the fourth connector of the second wiring member; and a switching part that can switch between electrical connection and electrical disconnection between the fifth connector and the sixth connector. an energy harvesting module (20, 20a, 20b, 200) as a circuit module that can output, from the first connector (21, 31, 41, 210, 310) and the second connector (22, 32, 42, 220, 320), electric power obtained through energy harvesting; and a load module (30, 30a, 30b, 300) as a circuit module that can consume electric power input from the first connector (21, 31, 41, 210, 310) and electric power input from the second connector (22, 32, 42, 220, 320); wherein the fourth connector of the first wiring member is mechanically and electrically attached to the second connector (22, 32, 42, 220, 320) of the circuit module of the first circuit module group, wherein the third connector of the second wiring member is mechanically and electrically attached to the first connector (21, 31, 41, 210, 310) of the circuit module of the second circuit module group, wherein the power wiring device (1, 2) further comprises a switching member including: a fifth connector that is mechanically and electrically attached to the third connector of the first wiring member; a sixth connector that is mechanically and electrically attached to the fourth connector of the second wiring member; and a switching part that can switch between electrical connection and electrical disconnection between the fifth connector and the sixth connector.