To provide a link spring device capable of elastically supporting an object placed on an upper part of a link mechanism wherein the entire link mechanism moves just like one spring.

In the link spring device, link members 11a, 11b made by forming an X shape by crossing link plates 15a, 15b and confronting them against each other and crossing points of the respective link members 11a, 11b are connected by a center shaft 17 and respective positions near end parts of the link plates 15a, 15b are connected by connection shaft 19a, 19b to form a link unit 10. An expandable and contractable link mechanism is formed by connecting a plurality of link units 10, sharing the link shaft 19a at an upper side of the link unit 10 and the link shaft 19b at a lower side of the link unit. An elastic member 20 is provided to energize the link shafts 19a, 19a, 19b, 19b at at least two positions in a direction to expand the link mechanism.