In this paper, we discuss the fluctuation theorem for channel-facilitated transport of solutes through a membrane separating two reservoirs. The transport is characterized by the probability, P-n(t), that n solute particles have been transported from one reservoir to the other in time t. The fluctuation theorem establishes a relation between P-n(t) and P-(n)(t): The ratio P-n(t)/P-(n)(t) is independent of time and equal to exp(n beta A), where beta A is the affinity measured in the thermal energy units. We show that the same fluctuation theorem is true for both single- and multichannel transport of noninteracting particles and particles which strongly repel each other.