A support device includes: two support arms movably supported along an axial direction; a driver causing the support arms to approach and separate; and two chucks rotatably mounted on tip portions of the support arms for supporting a paper roll. The chucks include: a main body having an outer diameter decreasing toward a tip portion, and guide parts along the axial direction provided on an outer circumference; and a support members including a receiving part movably supported by the guide parts and for contacting an end of the paper roll, and a support part for contacting an inner circumference of the paper roll. A movement unit includes a movement member for contacting the support members and moves the support members to the tip portion side by the movement member. A force applying device applies force in such a direction that the support members and the movement member approach each other.