NOVELTY - The fixation structure has a frame material (10) with an accommodation ditch (11) to accommodate a head piece of a bolt (B). Another frame material (30) is fixed to the former frame material. A reinforcement element (50) is formed in the accommodation ditch. A positioning screw (70) is provided in the former frame material. The former frame material has a pair of latching element (12) extended inside from the groove side wall of both sides of accommodation ditch. The reinforcement element is arranged so that the axial piece of bolt is penetrated while inserting inside the accommodation ditch.    USE - Fixation structure for fixing frame material of solar panel mount frame for fixing solar panels, such as a solar cell panel, and a solar water heater.    ADVANTAGE - The contact area to the latching element is enlarged by providing a reinforcement element, the pushing pressure force which a reinforcement element tends to move upwards is distributed to a large area by the structure, and is applied to the latching element. Therefore, contact-pressure concerning the latching element is made small, and deformation of the latching element is suppressed, and hence a large negative pressure is endured for providing easy positioning and fixation of a frame material.    DETAILED DESCRIPTION - The movement to a direction is regulated among the groove longitudinal direction on the positioning screw. The positioning screw interposes between the bolt head piece and the latching element. The latching element and the latter frame material is clamped with the reinforcement element and a nut (N). An INDEPENDENT CLAIM is included for a fixing method for the frame material, involves inserting reinforcement element inside the accommodation ditch along a groove longitudinal direction.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional side view of a fixation structure of frame material. (Drawing includes non-English language text).    Frame materials (10,30)    Accommodation ditch (11)    Latching element (12)    Reinforcement element (50)    Positioning screw (70)    Bolt (B)    Nut (N)