Abstract: A detachable shelter frame, adapted for mounting in front of a primary spectacle frame, includes a shelter frame for supporting two auxiliary lenses thereon and two interlocking arrangements which are provided at two sides of the auxiliary lenses respectively. Each of the interlocking arrangements includes a supporting arm rearwardly extending from the shelter frame towards an engagement member of the primary spectacle frame and a magnetic seat which is connected to the respective supporting arm and arranged to magnetically attach to the respective engagement member from behind. Each of the magnetic seats has a side opening having a width equal to or slightly larger than a height of the respective engagement member in such a manner that when the magnetic seats are magnetically attached with the engagement members respectively, the engagement members are capable of linearly sliding through the side openings respectively.