Abstract: An improved sigmoidoscope designed to be inserted into the rectum including a tubular member having opposite open ends with a passageway extending therebetween, an end portion of the tubular member being formed to be bendable as by weakening one side thereof to facilitate bending in a predetermined direction, an elongated flexible member attached to the tubular member adjacent the bendable end portions thereof and extending longitudinally along a portion of the length thereof, and an operator member attached to the elongated flexible member and movable to longitudinally displace the elongated flexible member to thereby apply sidewise bending motion to the bendable end portion of the tubular member. The device may optionally also include a cover layer extending over at least the bendable end portion thereof, and a grip to facilitate holding and manipulating the device.