Timing is crucial in many aspects of our perception and behavior. Although several psychological and computational models of timing have postulated that elapsed time is represented by a population of neurons that have selectivity for specific durations, empirical evidence of this notion has been lacking. Here, using an fMRI adaptation paradigm, we present evidence of temporal tuning in the right inferior parietal lobule (rIPL) by showing that the rIPL exhibited reduction in blood-oxygenation-level-dependent signal due to adaptation when a visual stimulus of the same duration was repeatedly presented. Neural adaptation was strongest when stimuli of identical durations were repeated, and it gradually decreased as the perceptual difference between the reference and test durations increased. This tuning property was found across a broad range of subsecond durations, indicating the presence of time-representation mechanisms in the rIPL. Furthermore, adaptation was observed irrespective of the subject's attention to time, suggesting an automatic encoding mechanism of stimulus duration in the rIPL. A control experiment confirmed that repetition of a non-temporal aspect of the stimulus (i.e., shape) did not produce neural adaptation in the rIPL. Our study demonstrates, for the first time, the neural evidence of duration-tuned representations in the human brain.