An electronic endoscope apparatus comprising: an electronic endoscope including an insertion portion, an operation portion which is provided on a proximal end side of the insertion portion, and a universal cord which extends from the operation portion so as to be connected to a video processor; a first image pickup cable having a predetermined length and a first diameter (Da) for connecting the operation portion to the video processor, the first image pickup cable being configured to be able to be disposed in the universal cord and including a first electromagnetic overall shield being grounded for noise shielding and having a first surface area (S31As) corresponding to the first diameter (Da); a second image pickup cable having the same predetermined length as the first image pickup cable and a second diameter (Db) smaller than the first diameter (Da) for connecting the operation portion to the video processor, the second image pickup cable including a second electromagnetic overall shield being grounded for noise shielding and having a second surface area (S31Bs) corresponding to the second diameter (Db); and an electromagnetic covering member which covers the second image pickup cable as an outer cover and which is electrically connected to a second electromagnetic overall shield and grounded for noise shielding having the same predetermined length, a third diameter and a reinforcement surface area (S38Bs) corresponding to the third diameter, characterized in that the second image pickup cable and the electromagnetic covering member are configured to be able to be disposed in the universal cord instead of the first image pickup cable; and the sum of the second surface area (S31Bs) of the second electromagnetic overall shield and the reinforcement surface area (S38Bs) of the electromagnetic covering member is set to be equal to or larger than the first surface area (S31As) of the first electromagnetic overall shield such that a noise shielding of the second image pickup cable is set to be equal to or larger than a noise shielding of the first image pickup cable. an electronic endoscope including an insertion portion, an operation portion which is provided on a proximal end side of the insertion portion, and a universal cord which extends from the operation portion so as to be connected to a video processor; a first image pickup cable having a predetermined length and a first diameter (Da) for connecting the operation portion to the video processor, the first image pickup cable being configured to be able to be disposed in the universal cord and including a first electromagnetic overall shield being grounded for noise shielding and having a first surface area (S31As) corresponding to the first diameter (Da); a second image pickup cable having the same predetermined length as the first image pickup cable and a second diameter (Db) smaller than the first diameter (Da) for connecting the operation portion to the video processor, the second image pickup cable including a second electromagnetic overall shield being grounded for noise shielding and having a second surface area (S31Bs) corresponding to the second diameter (Db); and an electromagnetic covering member which covers the second image pickup cable as an outer cover and which is electrically connected to a second electromagnetic overall shield and grounded for noise shielding having the same predetermined length, a third diameter and a reinforcement surface area (S38Bs) corresponding to the third diameter, characterized in that the second image pickup cable and the electromagnetic covering member are configured to be able to be disposed in the universal cord instead of the first image pickup cable; and the sum of the second surface area (S31Bs) of the second electromagnetic overall shield and the reinforcement surface area (S38Bs) of the electromagnetic covering member is set to be equal to or larger than the first surface area (S31As) of the first electromagnetic overall shield such that a noise shielding of the second image pickup cable is set to be equal to or larger than a noise shielding of the first image pickup cable.