Plaster knife for finishing a plastered surface, comprising: - a blade-shaped knife provided with a longitudinal side and an opposite knife side; - an elongated holder arranged along the longitudinal side of the blade-shaped knife for at least partly strengthening the longitudinal side of the blade-shaped knife; - an elongated handle having a longitudinal axis, which elongated handle is arranged to the elongated holder in a first position, in which the longitudinal axis of the elongated handle is arranged perpendicular with respect to the longitudinal side of the blade-shaped knife; - a pivot hinge defining a rotational axis arranged perpendicular with respect to the plane in which the blade-shaped knife is located, which pivot hinge is arranged between the elongated handle and the elongated holder for rotating the elongated handle with respect to the elongated holder about said rotational axis, from the first position to a second position, characterized in that, the plaster knife further comprises; an elongated spacer having a longitudinal axis, which longitudinal axis is arranged perpendicular to the plane in which the blade-shaped knife is located and which longitudinal axis coincides with the rotational axis for rotating the elongated handle with respect to the elongated holder, which elongated spacer is arranged between the elongated handle and the elongated holder for spacing the elongated handle with respect to the elongated holder and with respect to the plane in which the blade-shaped knife is located, such that the elongated handle can be rotated in a plane parallel to the plane in which the blade-shaped knife is located from the first position into the second position, in which second position the elongated handle is situated above the blade-shaped knife. - a blade-shaped knife provided with a longitudinal side and an opposite knife side; - an elongated holder arranged along the longitudinal side of the blade-shaped knife for at least partly strengthening the longitudinal side of the blade-shaped knife; - an elongated handle having a longitudinal axis, which elongated handle is arranged to the elongated holder in a first position, in which the longitudinal axis of the elongated handle is arranged perpendicular with respect to the longitudinal side of the blade-shaped knife; - a pivot hinge defining a rotational axis arranged perpendicular with respect to the plane in which the blade-shaped knife is located, which pivot hinge is arranged between the elongated handle and the elongated holder for rotating the elongated handle with respect to the elongated holder about said rotational axis, from the first position to a second position, characterized in that, the plaster knife further comprises; an elongated spacer having a longitudinal axis, which longitudinal axis is arranged perpendicular to the plane in which the blade-shaped knife is located and which longitudinal axis coincides with the rotational axis for rotating the elongated handle with respect to the elongated holder, which elongated spacer is arranged between the elongated handle and the elongated holder for spacing the elongated handle with respect to the elongated holder and with respect to the plane in which the blade-shaped knife is located, such that the elongated handle can be rotated in a plane parallel to the plane in which the blade-shaped knife is located from the first position into the second position, in which second position the elongated handle is situated above the blade-shaped knife.