A projector device comprising: a projector configured to project an image onto a projection surface; an accelerometer configured to detect inclination of the projector with respect to a horizontal surface to output an inclination angle value of the projector; and a distortion corrector configured to correct a trapezoidal distortion in an image projected and displayed on the projection surface based on a plurality of inclination angle values of the projector detected by the accelerometer, wherein the distortion corrector is configured to set a sampling time period during which the accelerometer outputs the plurality of inclination angle values of the projector; set a value of limit angle (A L) configured to be compared with the difference in representative angles between the current sampling time period and a previous sampling time period, wherein the limit angle (A L) is greater than a minimum angle value (α) that defines an inclination angle value subjected for distortion correction by the distortion corrector, calculate a representative angle value (Ax) of a current sampling time period based on the plurality of inclination angle values of the projector that are detected by the accelerometer for the current sampling time period; calculate the difference between the representative angle value (Ax) obtained for the current sampling time period and a representative angle value (A x-1) obtained for the previous sampling time period; determine whether the difference in the representative angle values (Ax, A x-1) is equal to or greater than the limit angle value (A L); and correct trapezoidal distortion in an image to be projected when the difference in the representative angle values (Ax, A x-1) is equal to or greater than the limit angle value (A L), characterized in that the distortion corrector is further configured to calculate the minimum angle value (α) using an equation depending on a projection distance of the projection device. a projector configured to project an image onto a projection surface; an accelerometer configured to detect inclination of the projector with respect to a horizontal surface to output an inclination angle value of the projector; and a distortion corrector configured to correct a trapezoidal distortion in an image projected and displayed on the projection surface based on a plurality of inclination angle values of the projector detected by the accelerometer, wherein the distortion corrector is configured to set a sampling time period during which the accelerometer outputs the plurality of inclination angle values of the projector; set a value of limit angle (A L) configured to be compared with the difference in representative angles between the current sampling time period and a previous sampling time period, wherein the limit angle (A L) is greater than a minimum angle value (α) that defines an inclination angle value subjected for distortion correction by the distortion corrector, calculate a representative angle value (Ax) of a current sampling time period based on the plurality of inclination angle values of the projector that are detected by the accelerometer for the current sampling time period; calculate the difference between the representative angle value (Ax) obtained for the current sampling time period and a representative angle value (A x-1) obtained for the previous sampling time period; determine whether the difference in the representative angle values (Ax, A x-1) is equal to or greater than the limit angle value (A L); and correct trapezoidal distortion in an image to be projected when the difference in the representative angle values (Ax, A x-1) is equal to or greater than the limit angle value (A L), characterized in that set a sampling time period during which the accelerometer outputs the plurality of inclination angle values of the projector; set a value of limit angle (A L) configured to be compared with the difference in representative angles between the current sampling time period and a previous sampling time period, wherein the limit angle (A L) is greater than a minimum angle value (α) that defines an inclination angle value subjected for distortion correction by the distortion corrector, calculate a representative angle value (Ax) of a current sampling time period based on the plurality of inclination angle values of the projector that are detected by the accelerometer for the current sampling time period; calculate the difference between the representative angle value (Ax) obtained for the current sampling time period and a representative angle value (A x-1) obtained for the previous sampling time period; determine whether the difference in the representative angle values (Ax, A x-1) is equal to or greater than the limit angle value (A L); and correct trapezoidal distortion in an image to be projected when the difference in the representative angle values (Ax, A x-1) is equal to or greater than the limit angle value (A L), characterized in that