The disclosure includes an electro-optical device supporting device, which interposes a flat flexible member extending from a held member in a vertical direction and holds the posture of the held member. The held member may include a substrate having a display region and an electro-optical material in the display region of the substrate. The supporting device includes a first member that supports neighboring portions of both ends of the flat flexible member in a widthwise direction from a lower side of the flat flexible member, and a second member that pushes down a center portion of the flat flexible member in the widthwise direction from an upper side. A concave portion is formed in the center portion of the first member in the widthwise direction. A convex portion for deforming the flat flexible member by pushing down the flat flexible member is formed in the second member so as to correspond to the concave portion of the first member.