Abstract: A retaining device for decoration articles secured to the ends of the suspension rod of a Venetian blind is provided. One end of each decoration article is provided with a cylindrical receiving cavity of a proper depth. The receiving cavity is defined in a tapered manner with its diameter gradually decreased inwardly to form an abutment wall for use in a suspension rod of a larger diameter which can be inserted into the decoration article and firmly held in place. At the bottom of the cavity is disposed an axially extended retaining post which has a plurality of radially protruded retaining plates. The front end of each retaining plate is provided with a smoothly arched edge and each retaining plate is gradually tapered with its height gradually increased inwardly.