A reactor device includes a reactor including at least one reacting unit supplied with a reactant to cause a reaction, a terminal portion provided at the reacting unit, and an electrically conductive member comprising an electrically conductive material and connected to the terminal portion, a space which extends between the terminal portion and an end face of the reactor, wherein the electrically conductive member is routed to outside the reactor through the space from the terminal portion to the end face of the reactor, and the electrically conductive member is fixed to the reactor at the end face.