A spectacle structure includes an inner frame unit having two connected horizontal U-shaped frame members respectively formed from an upper, a laterally outer and a lower frame section, the upper frame sections being connected to each other, each of the outer frame sections being provided with two horizontal grooves and a post or a recess or a through hole located between the two grooves, and each of the lower frame sections having a forward and inward extended support section; a lens unit having two connected lenses, each of which being provided with two horizontal ribs and a recess or a through hole or a post corresponding to the outer frame section, allowing the inner frame unit to be firmly assembled to and conveniently disassembled from a rear side of the lens unit; and a wear unit being pivotally connected to two opposite ends of the lens unit.