The present invention provides: a multilayered fiber structure which has excellent comfort and visibility, while having high flame retardancy; and a clothing item and a work wear, each of which uses this multilayered fiber structure.　This multilayered fiber structure has at least a front surface layer, a node layer and a back surface layer; the front surface layer is a fiber structure layer that is composed of one or more kinds of fibers A selected from among polyester fibers and acrylic fibers; the back surface layer is a fiber structure layer that is composed of a composite spun yarn obtained by blend spinning modacrylic short fibers B; the mass content of the modacrylic short fibers B in this multilayered fiber structure is from 30 to 70% by mass; the air permeability of this multilayered fiber structure is from 5 to 60 cm3/(cm2∙sec); and the cover factor of this multilayered fiber structure is from 1,800 to 2,500.