An hBN powder containing an aggregate of primary particles of hBN, the hBN powder having a ratio of an average longer diameter (L1) to an average thickness (d1) of the primary particles, [L1/d1], of 10 to 25, a tap density of 0.80 g/cm3 or more, and a BET specific surface area of less than 5.0 m2/g, in which a particle size distribution curve showing a frequency distribution based on volume of the hBN powder is a bimodal distribution curve having a first peak and a second peak in a range of a particle size of 500 μm or less and having a peak height ratio of a second peak height (HB) to a first peak height (HA), [(HB)/(HA)], of 0.90 or less, a method for producing the same, and a resin composition and a resin sheet each comprising the hBN powder.