PROBLEM TO BE SOLVED: To provide an electric junction box having excellent versatility and expandability while suppressing complication of shape. SOLUTION: The first base 11 on which electronic components are mounted and a second base on which electronic components are mounted and assembled to the first base 11 are provided. The pair of end face portions 22 facing each other in the first base 11 are provided with guide ribs 31 for engaging with the guide grooves formed in the second base and guiding the second base along the assembling direction. The lower cover locking claw 32 for locking the first lower cover 12 assembled so as to cover the lower opening of the first base 11 is formed on the 31. The first base 11 and the second base 11 and the second base 11 are formed on the second base. A locking projection for locking the second lower cover, which is assembled so as to collectively cover the lower opening of the base, is formed. [Selection diagram] Fig. 2
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