The purpose of this paper is to investigate the existence and uniqueness of a solution, and the continuous dependence on the input data of the solution of integro-differential equations with a positive constant coefficient involving fractional order derivative (FIDEs). In addition, we also provide the sufficient conditions for the Hyers-Ulam stability (HU-stability) and the Hyers-Ulam-Rassias stability (HUR-stability) of FIDEs. Finally, the HUR-stability of the well-known model of RLC circuit in the form of FIDEs is also surveyed.