To provide a stepladder capable of preventing the occurrence of a clearance in a connection part to prevent the occurrence of play, increasing connection strength, supporting a load applied on a support column leg sufficiently, and improving the strength of the whole stepladder when dividing the leg of the stepladder into upper and lower parts and connecting them so as to fold.

The support column leg 1 consists of an upper main leg 1a and a lower main leg 1b connected with the upper main leg 1a turnably, and overlapping parts 7a, 7b forming a projecting stripe 15 as a locking part on side faces are provided in a connection part of the upper main leg 1a and the lower main leg 1b. The overlapping parts 7a, 7b are tightened and fixed by a tightening fitting 9 journaled to either of the upper main leg 1a and the lower main leg 1b turnably from the outside, and a groove stripe 16 as an engaging part engaging with the locking part formed in the overlapping parts 7a, 7b is formed in the tightening fitting 9.