[Problem] To provide a rheumatoid arthritis experience orthosis that enables a healthy person to correctly experience finger joint dysfunction actually experienced by a rheumatoid arthritis patient. SOLUTION: A rigid MP joint bending tool 100 in a shape of a letter to a side view position for positioning an MP joint having a back covering part 110 and a base covering part side covering part 120 in a bending position, and a palm of the MP joint bending tool 100. An elastic first pad 210 which is disposed on the inner side which is the side and abuts on the instep side of the base of the forefinger, the middle finger, the ring finger and the little finger, and the first pad 210 with a space therebetween. A pair of pads 200 disposed on the inner surface and having an elastic second pad 220 that abuts on the substantially finger side half of the back of the hand, and the MP joint bending tool 100 are pressed to fix the MP joint in the bending position And a flexible band 300. [Selected figure] Figure 1
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