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Hoyle-Lyttleton type accretion was investigated by taking into account not only the effect of radiation pressure but also that of radiation drag. We calculated the trajectories of particles for three cases: only the effect of gravity is considered (case A); the effect of radiation pressure is taken into account (case B); the effect of radiation drag as well as radiation pressure is taken into account (case C). The accretion radii for the former two cases are IGMjv^ for case A and 2GM(1 -r)/t^ for case B, where M is the mass of the accreted object, VQQ the relative velocity, and T the normalized luminosity of the accreted object. We found that the accretion radius for case C is in between those of cases A and B under the present approximation; i.e., the accretion radius decreases due to radiation pressure, while it increases due to radiation drag. In addition, the accretion radius for case C becomes larger as the incident velocity becomes fast. The effect of radiation drag becomes ever more important when the velocity of the incident particle is comparable to the light speed.

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