To provide a decorative frame fixing tool capable of fixing a decorative frame without using an adhesive, coping with the sizes and shapes of various decorative frame, and reducing the number of part items.

This decorative frame fixing tool 90 is provided with an engaging means 94 capable of engaging a decorative frame 30 on the surface of the indoor side and connecting means 91 arranged at both ends of the decorative frame fixing tool 90 and capable of connecting the decorative fixing tool to other decorative frame fixing tools 90. The connecting means 91 of one decorative frame fixing tool 90 is provided with an engaging section 71 to be coupled with another decorative frame fixing tool 90 or an engaged section 51 engaging with the engaging section 71 of the other decorative frame fixing tool 90. When the engaging section 71 and the engaging section 51 are engaged, two decorative frame fixing tools 90 are connected together, and the decorative frame fixing tools 90 can be continuously formed on the surface of the indoor side of a building skeleton 14.