A tilting portable electronic device includes a base, a cover, at least one connecting bar, a swinging plate and an elastic member. The connecting bar and the swinging plate respectively rotatably connect to the base and the cover. The elastic member is secured with the swinging plate and has an end portion slidably resisting against the cover. when the cover is opened relative to the base, the connecting bar and the swinging plate rotate to support one end of the cover in a slanted position relative to the base, the elastic member is compressed, the end portion slides and resists the cover to make the cover sliding automatically after the cover slides a predetermined distance.