The aim of the present study was to investigate whether attention plays an important role in emotional devaluation through response inhibition. Accordingly, we conducted three experiments to clarify this issue. In Experiments 1 and 2, we examined the effect of response inhibition to attended pictures on their emotional devaluation. As in the previous studies, affective rating was preceded by a go/no-go task (Kiss et al., 2008; Doallo et al., 2012), where participants were asked to make a go or no-go response depending on the category of picture. Following the go/no-go task, participants were asked to report their preference for pictures that had appeared in the go/no-go task. Because the experimental procedure in Experiments 1 and 2 was similar to that of the previous studies (Kiss et al., 2008; Doallo et al., 2012), we predicted that emotional devaluation through response inhibition would occur. That is, the pictures that were previously presented as no-go stimuli would be evaluated less positively than the pictures that were presented as go stimuli. In Experiment 3, we examined the effect of response inhibition on the emotional devaluation of unattended stimuli concurrently presented with no-go cues. In contrast to Experiments 1 and 2, participants were asked to make a go or no-go response depending on the category of a digit target superimposed on the picture stimuli. Following the go/no-go task, participants were asked to rate their preference for the pictures that were (presumably) not attended to in the preceding go/no-go task. If attention plays an important role in the devaluation effect due to response inhibition, emotional devaluation would be attenuated in Experiment 3 compared with that in Experiments 1 and 2. In contrast, if attention is not necessary for emotional devaluation through response inhibition, comparable devaluation effects should be found in all experiments.