A chair device has a support frame and a seat disposed on the support frame. The support frame has a first U-shaped leg, a second U-shaped leg, a pipe connected to the first U-shaped leg and the second U-shaped leg, a tube connected to the first U-shaped leg and the second U-shaped leg, a first confining rod disposed on the first U-shaped leg and the second U-shaped leg, and a second confining rod disposed on the first U-shaped leg and the second U-shaped leg. The seat has a first metal ring, a second metal ring, a third metal ring, and a plurality of bands. The bands are sewed with the first metal ring, the second metal ring, and the third metal ring radially.