A storage medium storing a musical performance program and a musical performance device are provided. A musical sound is output through a clicking operation performed on an operation button, and a tone parameter is changed through a dragging operation. A parameter display part 6a is displayed on the operation button. When the musical sound is output through a clicking operation performed on the operation button, a user can recognize a state of the tone parameter of the output musical sound in advance through the parameter display part. Since the tone parameter set through a dragging operation performed on the operation button is reflected to the parameter display part, the tone parameter is recognized without looking away from the operation button.