The objective of this research is studying marketing mix factors which influence
purchasing decision process for Wai Wai Instant Noodles product. It also studies how Consumer
Behavior and marketing communication tools can influence decision in purchasing instant
noodles of consumers living in Bangkok. 400 people of sample population, who are the
consumers buying Wai Wai Instant Noodles, are interviewed, and the survey tools are used to
collect and document the data. All data are analyzed and converted into statistical data, average
percentage of standard deviation t-test, and one-way analysis of variance. The result of this
study shows that Marketing mix factors which the sample group rated as the most important
factor is the product followed by location, distribution channels, and price, respectively. The
marketing communication tools which mostly affect purchasing behavior for Wai Wai Instant
Noodles is public relation, followed by direct marketing, and sales promotion.