To provide bag filter structure having a filter cloth structure providing preferable soot and dust shaking-off performance by increasing an amount of deformation of the filter cloth.

In the bag filter structure provided with a pulse jet backwashing type filter cloth structure 20 wherein soot and dust in combustion flue gas are eliminated by passing the combustion flue gas from the outside of the filter cloth 30 covered over the outer periphery of a skeletal member 21 into the inside, and the soot and dust accumulated on the outside of the filter cloth 30 are shaken off and removed by the pulse jet introduced inside, rod-like axial members 22 of the skeletal member 21 extended in the axial direction of the bag filter forming a cross section of the filter cloth of the filter cloth structure 20 are disposed with spaces to form concave parts 31 in the cross section of the filter cloth.