The article explains that there are three types of intruder and the intruder in the sociology of consumption is a concept that coincides with the consumer and supports its main features. The consumer is an intruder, or rather a stranger, because refractory to the analysis and studies. This is not just an epistemological question, because the today consumer eludes us because of the system of consumption that has made us strangers to ourselves. That happens because the human being is rapidly changing technological and anthropological, and because he is now out of place in the world as demonstrated by the state of the placet, by the growing ecological crisis and by the issue of the sustainability. The opacity of the consumer testifies to the opacity of the society that is increasingly difficult to investigate unless the sociology of consumption uses new heuristic concepts useful to improve our understanding and the power of the search.
Keywords: Intruder, foreign, consumption mix, consumer, reflexivity, system