To provide a damper device capable of reducing costs and assembling man-hours by reducing the number of components.

In this damper device 1, a baffle 4 is rotated by back and forth motion of an output member 6 connected with an approximate center in the width direction of the baffle 4. A rotation supporting portion 9R is constituted by fitting a shaft portion 40R formed on a baffle plate 41 made of a resin to a shaft hole 30R formed on a side plate portion 32R of a frame 3 made of a resin in the baffle 4, in rotatably mounting the baffle 4 to the frame 3.