1. A supporting structure for supporting a device, comprising:a base portion configured to support the device; and
a plurality of leg portions configured to support the base portion,
wherein at least one of the plurality of leg portions includes a height adjusting mechanism whose length is adjustable in a height direction of the base portion, and a ground contact member configured to make contact with a ground, the ground contact member is fixed to the base portion with the height adjusting mechanism sandwiched between the ground contact member and the base portion so as to fix the height adjusting mechanism, and the ground contact member has a ground contact surface formed as a convex-shaped curved surface,
the height adjusting mechanism includes a wedge-shaped member, an upper member, and a lower member, the upper member and the lower member sandwiching the wedge-shaped member from above and below, the base portion and the ground contact member sandwiching the height adjusting mechanism from above and below, whereby the height adjusting mechanism is fixed.