A handheld apparatus with touch input function is provided. The handheld apparatus includes a casing and a cover collectively defining an accommodation space for accommodating a control circuit chip and a touch-sensitive module. The touch-sensitive module includes a first and a second touch sensor set. The second touch sensor set includes separate sensor pads arranged in a column, and each sensor pad is connected to the control circuit chip through a respective trace. In a first mode, at least one of the sensor pads senses a first capacitance change thereof in response to an object positioned near or on the sidewall. In a second mode, the sensor pads are connected in parallel to form at least one sensor electrode, which cooperates with the first touch sensor set to sense a second capacitance change thereof in response to the object positioned near or on the cover.