To horizontally convey a plate-like object to be conveyed having a projection formed on a back side in a conveyance state without interfering with the projection, and to reduce damage to the object to be conveyed due to contact with a roller.

A roller conveying device includes a pair of roller supporting bodies 42 arranged to face each other at a predetermined interval, and many pairs of resin short-shaft rollers R₁ which are arranged on the same axial center C, and supported in a cantilever state via a roller supporting shaft S₁ on the inside of the pair of roller supporting bodies 42. A flange body 2 is integrally formed only at an end on a supporting side in a shaft direction on the roller body 1 of the short-shaft roller R₁.