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In this paper, we present an ultra low power IEEE802.15.4 module and its applications for batteryless wireless sensors. We realized the module with very low power consumption. The sleep current including LCD is 3.5 uA and average current is 5 uA with 10 second data sampling period. This module is expected to work with two AA batteries for 10 years or longer. We tested some batteryless wireless sensor applications, including a solar power generator, a vibration power generator and a micro wind power generator. In the solar power generator test, we realized that continuous operation under ordinary office environment with a small panel sized 53 mm times 50 mm.