PROBLEM TO BE SOLVED: To provide a column connecting joint and a column in which a connecting work for connecting columns to each other or a connection releasing work can be performed in an easy and fast manner and a completed state can be confirmed.SOLUTION: There are provided a male joint member 4 having a fitting male part disposed at one end part of one column 1 and having an annular outer surface to connect columns 1 and 1 to each other and a female joint member 3 having a fitting female part 5 disposed at one end part of the other column 1 and having an annular inner surface into which the fitting male part 10 of the male joint member 4 is inserted and which is fitted to an outer surface of the fitting male part 10. An extremity end side of the fitting male part 10 in an inserting direction is provided with a large diameter part 10c having a larger outer diameter than an outer diameter at the base end side in the inserting direction and the fitting female part is provided with a step part to which a large diameter part of the fitting male part can be engaged as fitting with the fitting male part is attained.SELECTED DRAWING: Figure 1