Implicit eye movements exhibited by participants in false belief tasks have been interpreted as implicit processing of others’ mental states, i.e. an implicit theory of mind. However, this interpretation has been criticized because the same pattern of eye movements may result from behavioral rules or domain-general processes. An experience projection paradigm may be able to differentiate implicit theory of mind from these simpler processes, however to date this paradigm has not been implemented correctly. The aim of the current study was to test adults on an implicit false belief task to establish whether it tests implicit theory of mind. The study included 61 participants, 59 female and 2 male psychology students of Faculty of Humanities and Social Sciences in Rijeka, aged from 18 to 23. The proportion of participants verbally stating that the protagonist would look for the object in the original location was higher after the protagonist had been wearing opaque goggles than after the protagonist had been wearing transparent goggles. This explicit measure thus showed that participants correctly used their own experience of the two goggle types to anticipate where the protagonist would search for the object. The proportion of participants who directed their first look towards the object’s original location and the proportion of time spent looking at the original location were both higher after the protagonist had been wearing the opaque goggles than after the protagonist had been wearing the transparent goggles. These results provide evidence that the participants’ eye movements in an implicit false belief task are underpinned by an ability to implicitly process another’s mental state. In contrast to adults’ explicit answers, the implicit measures revealed that participants’ anticipatory looking behaviours for both measures were at chance for the false belief condition. Possible explanations for this pattern are that implicit mental state attribution measures might be susceptible to egocentric biases, that participants assume that the protagonist can hear the opening of the boxes, or that the implicit system does not process false beliefs in the same way as the explicit system.