An electrically heated catalyst device, comprising: a carrier having a metal catalyst supported thereon; a pair of comb-shaped electrodes, each including a proximal portion and a plurality of wire portions, the proximal portion extending along a longitudinal direction of the carrier, and the wire portions extending from the proximal portion along a circumferential direction of the carrier; a base layer formed on an outer peripheral surface of the carrier, the base layer being provided between each comb-shaped electrode and the carrier; and for each of the plurality of wire portions, a corresponding respective fixation layer is joined to the base layer, wherein: each respective fixation layer partially covers a respective wire portion, thereby fixing the respective wire portion on the base layer, each respective fixation layer is rectangular in shape when the outer peripheral surface of the carrier is seen from a direction orthogonal to a central axis of the carrier along the longitudinal direction, a pair of opposite first sides of each respective rectangular fixation layer are parallel with an extending direction of each wire portion on opposite sides of the wire portion, and a pair of second sides coupling opposite ends of the pair of first sides are orthogonal to the extending direction of each wire portion, and a respective gap is formed between the base layer and a region of each respective wire portion covered with the respective fixation layer. a carrier having a metal catalyst supported thereon; a pair of comb-shaped electrodes, each including a proximal portion and a plurality of wire portions, the proximal portion extending along a longitudinal direction of the carrier, and the wire portions extending from the proximal portion along a circumferential direction of the carrier; a base layer formed on an outer peripheral surface of the carrier, the base layer being provided between each comb-shaped electrode and the carrier; and for each of the plurality of wire portions, a corresponding respective fixation layer is joined to the base layer, wherein: each respective fixation layer partially covers a respective wire portion, thereby fixing the respective wire portion on the base layer, each respective fixation layer is rectangular in shape when the outer peripheral surface of the carrier is seen from a direction orthogonal to a central axis of the carrier along the longitudinal direction, a pair of opposite first sides of each respective rectangular fixation layer are parallel with an extending direction of each wire portion on opposite sides of the wire portion, and a pair of second sides coupling opposite ends of the pair of first sides are orthogonal to the extending direction of each wire portion, and a respective gap is formed between the base layer and a region of each respective wire portion covered with the respective fixation layer. each respective fixation layer partially covers a respective wire portion, thereby fixing the respective wire portion on the base layer, each respective fixation layer is rectangular in shape when the outer peripheral surface of the carrier is seen from a direction orthogonal to a central axis of the carrier along the longitudinal direction, a pair of opposite first sides of each respective rectangular fixation layer are parallel with an extending direction of each wire portion on opposite sides of the wire portion, and a pair of second sides coupling opposite ends of the pair of first sides are orthogonal to the extending direction of each wire portion, and a respective gap is formed between the base layer and a region of each respective wire portion covered with the respective fixation layer.