An internal combustion engine intake device is configured to suppress the occurrence of freezing in a portion thereof where blow-by gas or another gas is introduced into an intake passage. The intake device basically has a throttle chamber, an intake air collector, an air induction pipe, a partitioning part, a gas introducing pipe and a volume chamber. The air induction pipe is provided between the throttle valve and the intake air collector. The partitioning part divides the space inside the air induction pipe into first and second air induction spaces. The gas introducing pipe introduces the blow-by gas into the first and second air induction spaces directly. The blow-by gas contains moisture and has a higher temperature than the fresh air in the first and second air induction spaces. The volume chamber is arranged between the gas introducing pipe and the first and second air induction spaces.